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Binding of Isaac Rebirth Mechanics Guide
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| # Binding of Isaac Mechanics Guide | |
| ## Stats | |
| ### Health | |
| Each character starts with the following health | |
| * Isaac: 3 | |
| * Maggy: 4 | |
| * Cain: 2 | |
| * Judas: 1 | |
| * ???: 3 | |
| * Eve: 2 | |
| * Sam: 1 | |
| * Az: 0 | |
| * Laz: 3 | |
| * Eden: ? | |
| * Lost: 0 | |
| Additional heart containers can be obtained via the following items: | |
| #### +1 max heart | |
| * Lunch | |
| * Dinner | |
| * Dessert | |
| * Breakfast | |
| * Rotten Meat | |
| * Magic Mushroom | |
| * Odd Mushroom (Large) | |
| * The Halo | |
| * `<3` | |
| * Stem Cells | |
| * Holy Grail | |
| * MEAT! | |
| * SMB Super Fan! | |
| * Stigmata | |
| * Blood Bag | |
| #### +2 max hearts | |
| * Raw Liver | |
| * Bucket of Lard | |
| ### Luck | |
| Luck is a bit of a mystery stat. | |
| * Luck starts at 0 | |
| * If you're doing the "7 Years Bad Luck" challenge, you start with -2 luck | |
| * You can increase/decrease your luck by 1 with a "Luck Up/Down" pill | |
| * If you have Tough Love, a tooth will fire off with a probability of `1/(10 - | |
| luck)`. This means that a luck of 10 will guarantee a tooth, while a base luck | |
| of 0 gives you a tooth with 1/10 chance. I am not sure what will happen with | |
| more than 10 luck (`random(-1)` in ActionScript 2) | |
| * Luck affects the chance that you get an item after a room (see "Clearing a | |
| Room" section) | |
| ### Movement Speed (`_root.playsp`) | |
| * Base speed: 1 | |
| * Modifiers (upper bound 1): | |
| * Blood Bag: 0.3 | |
| * Wooden Spoon: 0.3 | |
| * Belt: 0.3 | |
| * Mini Mush: 0.3 | |
| * Halo: 0.3 | |
| * Whore of Babylon: 0.3 | |
| * Odd Mushroom (Small): 0.3 | |
| * Roid Rage: 0.6 (upper bounded at 1) | |
| * The Virus: -0.1 (lower bounded at -1 with Odd Mushroom (Large)) | |
| * Odd Mushroom (Large): -0.1 | |
| * Character bonus | |
| * Isaac: 0 | |
| * Maggy: -0.15 | |
| * Cain: 0.3 | |
| * Judas: 0 | |
| * ???: 0.1 | |
| * Eve: 0.23 | |
| * Sam: 0.1 | |
| * Growth hormones: 0.4 | |
| * The Mark: 0.2 | |
| * Lord of the Pit: 0.3 | |
| * Small Rock: -0.2 | |
| * Bucket of Lard: -0.2 | |
| * SMB Super Fan: -0.2 | |
| * Chariot card, My Little Unicon, The Gamekid activated: 0.28 | |
| * Goat Hoof: 0.15 | |
| * The Nail activated: 0.18 | |
| * Holding A Pony or White Pony: speed lower bounded at 1.5 | |
| ### Projectile Speed (`create(): f7 == 2`) | |
| * Base: 1 | |
| * Modifiers (upper bound 0.4): | |
| * Speed Ball: +0.2 | |
| * Cat-o-nine-tails: +0.23 | |
| * Stem Cells: +0.16 | |
| * Tooth Picks: +0.16 | |
| * Magic 8: +0.16 | |
| * Sacred Heart: -0.25 | |
| * Samson: +0.31 | |
| ### Fire Rate (`firr()`) | |
| * Rate modifiers | |
| * Number One: 1.5 | |
| * Wire Coat: 0.7 | |
| * Pact: 0.7 | |
| * Sad Onion: 0.7 | |
| * Odd Mushroom (Small): 1.7 | |
| * Squeezy: 0.4 | |
| * Wiggle: 0.4 | |
| * Sacred Heart: -0.4 | |
| * Halo: 0.2 | |
| * Small Rock: 0.2 | |
| * SMB Super Fan!: 0.2 | |
| * Samson: -0.25 | |
| * Calculation: | |
| base = 16 | |
| If positive modifiers: | |
| delay = 16 - sqrt(1 + modifiers * 1.3) * 6 | |
| If negative modifiers: | |
| delay = 16 - modifiers * 6 (double negative means higher delay) | |
| * Post-calculation Multipliers | |
| * Chocolate Milk: `delay = delay * 0.8` | |
| * Inner Eye, Ipecac, Polyphemus, or Mutant Spider: `delay = delay * 2.1 + 3` | |
| * Cancer: `delay = delay - 2` | |
| ### Damage (`dmgdo()`) | |
| #### Damage Sources | |
| * Devil Card or Book of Belial: 2 | |
| * Blood of the Martyr: 1 | |
| * Small Rock: 1 | |
| * Money=Power: `coins * 0.04` | |
| * Whore of Babylon: 1.5 * `val^2` | |
| * `val` = 1.5 if triggered via Empress Card | |
| * `val` = 1.2 if triggered by falling below 1 heart | |
| * `val` = 1.0 if triggered in a different room and has not left | |
| * Steven: 1 | |
| * Pentagram: 1 | |
| * Growth Hormones: 1 | |
| * The Mark: 1 | |
| * The Pact: 0.5 | |
| * Max's Head: 0.5 | |
| * Jesus Juice: 0.5 | |
| * Magic Mushroom: 0.3 | |
| * The Halo: 0.3 | |
| * Odd Mushroom (large): 0.3 | |
| * Stigmata: 0.3 | |
| * MEAT!: 0.3 | |
| * SMB Super Fan!: 0.3 | |
| * The Nail (used): 0.7 | |
| * Rage Effect (+1 damage per point) | |
| * Starts at +0 | |
| * Bloody Lust | |
| * When you kill a creature, you get +0.28 up to a cap of 3.3 | |
| * Samson's Lock | |
| * When you kill a creature, you get +0.50 up to a cap of 3.3 | |
| * Razor Effect (+0.6 damage per point, applied after Odd Mushroom (small) below) | |
| * Starts at +0 | |
| * Red Patch | |
| * When you take damage, 1/5 chance to get +3 razor | |
| * Razor Blade (use) | |
| * When you use razor blade, add +2 razor | |
| #### Other Interactions | |
| * Chemical Peel +2 damage if: | |
| * Every other tear | |
| * As Cain, 50% chance | |
| * Odd Mushroom (small): `damage = damage * 0.9 - 0.4` | |
| * Chocolate Milk without Brimstone | |
| * Charge power starts at 1 | |
| * Gain 1/10 charge power every frame (equates to 3 charge power per second) | |
| * Charge power caps at 5 (4/3 seconds charge length) | |
| * Damage bonus = (Charge power * 1.8 - 3) * 1.3 | |
| * Damage bonus cannot go below 0 | |
| * Full charge equivalent to +7.8 damage | |
| #### Main Calculations | |
| * Sum all the above effects | |
| * `damage = 3.5 * sqrt(1 + damage * 1.2)` | |
| * If polyphemus: | |
| * If inner eye or mutant spider: | |
| * `damage += 5` | |
| * Else | |
| * `damage = 2 * (damage + 4)` | |
| * `damage = character_mod * damage` | |
| * Isaac: 1.00 | |
| * Maggy: 1.00 | |
| * Cain: 1.20 | |
| * Judas: 1.35 | |
| * ???: 1.05 | |
| * Eve: 0.75 | |
| * Sam: 1.00 | |
| * More damage applications | |
| * Curved Horn: `damage = damage + 2` | |
| * Sacred Heart: `damage = damage * 2.3 + 1` | |
| * Technology 2: `damage = damage * 0.65` | |
| * Tears only: | |
| * Tough love: 1/(10 - luck) chance: `damage = damage * 3.2` | |
| * Lump of Coal: +0.14 damage every frame up to a maximum of 150 frames (5 | |
| seconds) for a maximum total of +21 damage | |
| * `damage = damage * 1.5` if at least one of the following three: | |
| * Max's Head | |
| * The Devil Card/Book of Belial *with* Blood of the Martyr | |
| * Magic Mushroom | |
| #### Damage benchmarks | |
| To express the amount of basic +damage items you need using the above values to | |
| increase your damage: | |
| * x2 damage: 2.5 | |
| * x3 damage: 6.67 | |
| * x4 damage: 12.5 | |
| * x5 damage: 20.0 | |
| #### Non-basic damage | |
| * Lasers | |
| * Technology, Brimstone | |
| * If you have Ipecac, The Inner Eye, Mutant Spider, or Polyphemus: `damage = damage * 3` | |
| * If you have A Lump of Coal: `damage = damage + 2` | |
| * If Brimstone, `damage = damage * 3` | |
| * If also Chocolate Milk, damage scales linearly to 100% at 60 | |
| frames (2 seconds) of charge | |
| * Technology 2 | |
| * Damage every 3 frames (10 times per second) | |
| * Damage = `damage * ?secol * 0.2` | |
| * Every time you fire a tear, `?secol = ?secol + 1` | |
| * Every time the lazer does damage, `?secol = ?secol * 0.8 + 0.2` | |
| * Mom's Knife | |
| * Base: `damage * (2 + ?knill)` | |
| * `?knill` is bounded to the range [0,4] | |
| * This is the most confusing clusterfuck of variable manipulation I have | |
| ever seen. I have no idea what is going on. | |
| * Blue Flies | |
| * Each fly does 2x base damage (before tear calculations) | |
| * A blue fly will spawn with a projectile or laser hit if one of the | |
| following is true: | |
| * Non-familiar projectile and 1/6 chance | |
| * Transformed into Guppy, `queued blue flies < 1`, `objects < 30`, and 1/3 chance if you have Technology 2 | |
| * Queued blue flies is drained by one every frame, so this mostly | |
| prevents things like Mutant Spider from granting 4 flies per shot | |
| * Objects refers to pretty much anything on the screen - pickups, | |
| enemies, projectiles, and possibly rocks. | |
| * The way this was written is likely buggy, as this means that familiars can | |
| spawn flies if you are Guppy, and extra blue flies can spawn (i.e., from | |
| Mutant Spider) with 1/6 chance after the first. | |
| #### Red Tears | |
| Though cosmetic, the tear color changes to red under the following conditions | |
| * You do not have Ipecac | |
| * You have one of the following items: | |
| * SMB Super Fan! | |
| * Blood of the Martyr | |
| * Tooth Picks | |
| * You have a Devil Card, Book of Belial, Whore of Babylon, or The Nail activated | |
| * Your final damage is over 5.5 (without Polyphemus) | |
| * Your final damage is over 15 (with Polyphemus) | |
| * If you have Chocolate Milk, the damage conditions above are not applicable | |
| * You are shooting from your empty eye socket with Peeper | |
| ## Item Mechanics | |
| ### Items that give drops | |
| * Magic 8 ball: `?kogs = [5.3]` | |
| * Mom's Coin Purse: `?kogs = [5.07, 5.07, 5.07, 5.07]` | |
| * Squeezy: `kogs = [5.010000003, 5.010000003]` | |
| * BOX: `kogs = [5.35, 5.07, 5.02, 5.010000003, 5.3, 5.03, 5.04]` | |
| ### Temporary Effects | |
| * `?ceye`: Compass | |
| * `?world`: Treasure Map + Compass | |
| * 3 dollar bill: Random tear | |
| * Whore of Babylon: on if player hearts < 1 | |
| * Liberty Cap + 1/4 chance: | |
| * Compass | |
| * Mini Mush | |
| * Odd Mushroom (small) | |
| * Odd Mushroom (large) | |
| ### Cancelled Effects | |
| * Dr. Fetus cancels... | |
| * Chocolate Milk | |
| * Epic Fetus cancels... | |
| * Chocolate Milk | |
| * Brimstone | |
| * Mom's Knife | |
| * Mom's Knife cancels... | |
| * Brimstone | |
| ### Health Restoration | |
| +0.5 hearts | |
| * Bucket of Lard | |
| +1 heart | |
| * Lunch | |
| * Dinner | |
| * Dessert | |
| * Breakfast | |
| * Rotten Meat | |
| * MEAT! | |
| * Stigmata | |
| * SMB Super Fan! | |
| * The Halo | |
| * Super Bandage | |
| * Fate (if you complete an eternal heart) | |
| +1.5 hearts | |
| * Stem cells | |
| +2 hearts | |
| * PHD | |
| +5 hearts | |
| * Blood bag | |
| Full restoration | |
| * Sacred Heart | |
| * Magic Mushroom | |
| * `<3` | |
| * Raw Liver | |
| ### Spirit Hearts | |
| From item pickups | |
| * Super Bandage: 2 | |
| * Sacred Heart: 1 | |
| * Rosary: 3 | |
| * The Mark: 1 | |
| * The Pact: 2 | |
| ### Eternal Hearts | |
| * Fate: 1/2 heart | |
| ### Gives Stuff | |
| * Bombs | |
| * Pyro: 99 | |
| * Remote Detonator: 5 (first time only) | |
| * Bobs Curse: 5 | |
| * Bobby - Bomb: 5 | |
| * Mr. Mega: 5 | |
| * Boom!: 10 | |
| * Keys | |
| * Skeleton Key: 99 | |
| * Coins | |
| * A dollar!: 99 | |
| * A Quarter: 25 | |
| ### Familiars | |
| * Projectile: All 3.5(?) | |
| * Brother bobby | |
| * Sister Maggy | |
| * The Robo-Baby | |
| * Little Gish | |
| * Little Steve | |
| * Demon Baby | |
| * Ghost Baby | |
| * Harlequin Baby | |
| * Rainbow Baby | |
| * Abel | |
| * Isaac's Head | |
| * Other combat | |
| * Mom's Knife | |
| * Cube of Meat: 7 | |
| * Meatboy: 3.5 | |
| * Full Meatboy: 5.5 | |
| * Guardian Angel: 7 | |
| * The Peeper: 8 | |
| * Guppy's Hairball: `3 + size * 2` | |
| * Sacrificial Dagger: 15 | |
| * Dead Bird: 2 | |
| * Daddy Longlegs: 20 | |
| * The Pinking Shears: 7 | |
| * Halo of Flies: 2 | |
| * Distant Admiration: 5 | |
| * Forever Alone: 2 | |
| * Lil Chubby: `?killshit()` | |
| * Blue Flies: `2 * damage` | |
| * Non-combat | |
| * Bum Friend | |
| * Dead Cat | |
| * 1up! | |
| * Sack of Pennies | |
| * Little Chad | |
| * The Relic | |
| * Bomb Bag | |
| * Holy Water | |
| * ???'s Soul | |
| ## Pills | |
| * PHD has a 1/150 chance of identifying a pill every frame (30 times/s). | |
| * If you find a negative pill and then acquire PHD or Lucky Foot, it will become | |
| its positive counter-part (Full Health being Bad Trip's). | |
| * Range Down pills will become Range Up if you have Number One and `?chaps < 8`. | |
| * When using or identifying a pill, the following sequence is executed, stopping | |
| whenever the pill has been decided. If another pill has this same effect, then | |
| the process starts over. | |
| 1. If you have less than max hearts (or are playing ??? and have less than 3 spirit | |
| hearts), 1/10 chance to get Full Health | |
| 2. 1/13 chance to get Bad Gas | |
| 3. 1/17 chance to get Friends til the end! | |
| 4. 1/17 chance to get Luck Up/Down | |
| 5. If you don't have PHD, 1/15 chance to get I Found Pills | |
| 6. 1/10 chance to get Explosive Diarrhea (always fails by bug in code) | |
| 7. 1/10 chance to get Balls of Steel | |
| 8. 1/20 chance to get Pretty Fly | |
| 9. If current hearts + spirit hearts > 1 and you don't have PHD or Lucky Foot, 1/9 | |
| chance to get Bad Trip! | |
| 10. 1/7 chance to get Health Up/Down | |
| 11. If either bombs or keys are over 0, 1/6 chance to get Bombs are Key | |
| 12. 1/5 chance or 1/4 chance to get Tears Up/Down (equivalent to 4/10 | |
| chance) | |
| 13. 1/3 chance to get Range Up/Down | |
| 14. 1/3 chance to get Speed Up/Down (guaranteed if you have PHD) | |
| 15. If nothing else, Telepills (obviously impossible with PHD) | |
| * All above Up/Down pills have an equal chance of spawning the Up or Down | |
| version | |
| * Pills effects | |
| * Tears Up: Adds Wire Coat hanger! +0.5 | |
| * Tears Down: Adds Wire Coat hanger! -0.4 | |
| * Range Up: Adds Moms Lipstick +0.5 | |
| * Range Down: Adds Moms Lipstick -0.4 | |
| * Speed Up: Adds Wooden Spoon +1 | |
| * Speed Down: Adds Wooden Spoon -0.8 | |
| ## Cards `tater()` | |
| * 4/5 chance to get random Tarot Card (22 total) | |
| * Otherwise random Deck Card (5 total) | |
| * Card effects | |
| * Strength: Magic Mushroom | |
| * Death: 60 damage to all enemies | |
| * The Devil: Book of Belial use effect | |
| ## Trinkets | |
| ### Trinket Pool | |
| * `?poli` -> Guaranteed Polaroid | |
| * Counterfeit Penny is not in the pool, but has a 1/3 chance to spawn from | |
| golden poop | |
| * Else -> Random trinket removed from the pool immediately | |
| * No trinkets left? Random card as above | |
| ### Fish Head | |
| Every time you get hit, you spawn one blue fly | |
| ### Pinky Eye | |
| * 1/10 chance to make a poison tear | |
| * If you have Technology, has a 1/10 chance of temporaraily disabling The common | |
| cold if you have it (possibly just for the color change) | |
| ### Push Pin | |
| 1/10 chance to make a spectral tear | |
| ### Liberty Cap | |
| 1/4 chance to give one of the following effects: | |
| * Compass | |
| * Mini Mush | |
| * Odd Mushroom (small) | |
| * Odd Mushroom (large) | |
| ### Umbilical Cord | |
| If you take damage have less than 1/2 heart (including spirit hearts), you gain | |
| Little Steve for the remainder of the room. | |
| ### Pickup-boosting trinkets | |
| * 1/10 chance to give you an item at the end of a room | |
| * 2/3 chance to give you an item when opening a chest | |
| * Types | |
| * Child's Heart: Heart | |
| * Rusted Key: Key | |
| * Match Stick: Bomb | |
| * Safety Cap: Pill | |
| * Ace of Spades: Card | |
| ### Curved Horn | |
| +2 damage (See damage calculation for exact step) | |
| ### Goat Hoof | |
| +0.15 movement speed (See speed calculations) | |
| ### Mom's Pearl | |
| 1/10 additional chance for any given heart drop to become a spirit heart | |
| ### Cancer | |
| Fire delay decreased by 2 (See fire rate calculations) | |
| ### Red Patch | |
| 1/5 chance to get +3 razor points when taking damage (See damage calculations | |
| for bonus damage) | |
| ### Lucky Toe | |
| Increases chance to drop an item at the end of the room... | |
| * by ~2% with Lucky Foot | |
| * by ~10% otherwise | |
| ### Cursed Skull | |
| Returns you to the previous room when you are hit with 1/2 heart remaining (not | |
| counting spirit hearts) after damage is calculated | |
| ### Isaac's Fork | |
| 1/10 chance to gain a half heart after clearing a room if you have at least 1 | |
| heart container. Does nothing for ???. | |
| ### The Polaroid | |
| * Grants 150 frames (5 seconds) of invulnerability when you are hit with 1/2 | |
| heart remaining (not counting spirit hearts) after damage is calculated | |
| * Grants access to the Chest if equipped while fighting Isaac | |
| ### A Missing Page | |
| 1/20 chance to deal 40 damage to all enemies in the room when taking damage | |
| ### Pennies | |
| * 1/2 chance to gain one of the following pickups when picking up any coin | |
| * Bloody Penny: Heart | |
| * Burnt Penny: Bomb | |
| * Flat Penny: Key | |
| * Counterfeit Penny: +1 coin (automatic) | |
| * These items do not have a chance to be upgraded (see Pickups section) | |
| ### The Tick | |
| * When an enemy spawns, if it has over 60 hp, 15% of that is removed immediately | |
| * When you enter a boss room and `?firsttime` is not set, you recover 1 heart | |
| ### Isaac's Head | |
| Creates a familiar that fires projectiles (See Familiars section) | |
| ### Maggy's Faith | |
| Grants 1/2 eternal heart at the beginning of every level | |
| ### Judas's Tongue | |
| Items that cost 2 hearts in a deal with the Devil will be reduced to 1 heart | |
| instead | |
| ### ???'s Soul | |
| Creates a familiar that moves around the room | |
| ## Pickups | |
| ### Hearts | |
| * Chance for a normal heart to become a spirit heart when dropped | |
| * Base 1/10 chance | |
| * Additional 1/16 chance if you are Eve | |
| * Additional 1/10 chance if you have Mom's Pearl | |
| * Additional 1/2 chance if you have Mitre | |
| * Chance for a normal heart to become an eternal heart when dropped: 1/50 | |
| * If you are in the super secret room that has an eternal heart in it, all | |
| hearts that spawn in that room will be eternal, i.e., through slot machines | |
| placed with Wheel of Fortune card. | |
| * 1/2 chance to set `col = 2` (full heart vs half?) | |
| ### Keys | |
| * 1/20 chance for golden key | |
| ### Bombs | |
| * 1/7 chance to set `col = 2` (1+1 free?) | |
| * 1/10 chance to set `col = 3` (troll bomb?) | |
| * 1/50 chance to set `col = 5` (homing troll bomb?) | |
| * Damage | |
| * Base: 10 | |
| * Mr. Mega: +50 | |
| ### Coins | |
| * 1/20 chance to be a nickel | |
| * 1/100 chance to be a dime | |
| ## Items | |
| ### How random items are selected | |
| * **TL;DR**: Just seeing an item on the screen means it was removed from that | |
| pool once\* and will not be picked again if there were no duplicate entries. | |
| Picking up the item guarantees that it will never show up on your screen ever | |
| again. You do *not* have to use activated items to guarantee this. | |
| * \*See note about depleting pools at the end of this section | |
| * When does this happen? | |
| * When you use the D6, this happens once for each item in the room | |
| * When an item is created on the screen. This should mean that items | |
| generated by donating to beggars spawned with the Judgement card will | |
| reflect the room they are in (defaulting to Treasure Room). | |
| * Try the following sequence 100 times. If you cannot find an item, default to | |
| using the first pool. | |
| * If you're in the library, try the 9th pool | |
| * When you choose an item, if `?lib` is the item chosen, looks like it tries | |
| to discard it so you don't get double, but it has a bug and it keeps it | |
| anyway. | |
| * If you're in the normal Challenge Room, try the 8th pool. | |
| * If you're in the Devil Room or `?bummer` == 2 or you're in the curse room: | |
| * Reset `?bummer` to false | |
| * If you're in the Angel Room, use pool 10 | |
| * Otherwise use pool 7 | |
| * If you're opening a golden chest and you're not in the 11th chapter (The | |
| Chest), use the 6th pool | |
| * If you're in The Shop or `?bummer` is set | |
| * Reset `?bummer` to false | |
| * Use the 4th pool | |
| * If you're in `?boner` or `?boner2` with 1/2 chance, try pool 5 (this | |
| doesn't even exist!) | |
| * If you're in the Secret Room, try pool 3 | |
| * If you're in the Boss Challenge Room, use | |
| pool 2 | |
| * If you're in a boss room | |
| * If you're fighting The Fallen, try to select an item from pool 7 that | |
| you do not have | |
| * If you're fighting Conquest and don't have White Pony, you get it | |
| * If you're fighting Headless Horseman and don't have A Pony, you get it | |
| * If you're fighting C.H.A.D and don't have, Little Chad, you get it | |
| * If you're fighting Gish and don't have Little Gish, you get it | |
| * If you're fighting Steven and don't have both Steven and Little Steve | |
| * 1/6 chance for Steven (or automatic if you have Little Steve) | |
| * otherwise Little Steve | |
| * If you're fighting Famine, Pestilence, War, or Death, you get Cube of | |
| Meat | |
| * Otherwise, try from pool 2 | |
| * If none of these are true, try from pool 1 | |
| * When an item is selected from a pool and passes the `itz` test, it is removed | |
| from the pool *immediately*, with the exception of pools 9 (library) and 10 | |
| (angel room). | |
| * What is the `itz` test? | |
| * This function is called on an item before it is shown to you. If it fails, | |
| then the item is re-rolled. | |
| * If you have more than 2 of these, any future picks will be re-rolled. | |
| Note that this does not prevent a boss from guaranteeing a drop, i.e., | |
| Gish will still drop Little Gish regardless of how many familiars you | |
| have. | |
| * Brother Bobby | |
| * Sister Maggy | |
| * Robo-Baby | |
| * Little Gish | |
| * Little Steve | |
| * Demon Baby | |
| * Ghost Baby | |
| * Harlequin baby | |
| * Rainbow Baby | |
| * Abel | |
| * If you have the upgrade, the item is re-rolled. You are considered having | |
| the item if you have picked it up at any time. | |
| * If you have picked up this item at some point in your save file, there is | |
| a 1/5 chance it will be re-rolled. | |
| * Check if it is a "special" item. I have made up this term, since I don't | |
| know what else to group these 57 items as. I believe they are all | |
| non-spacebar items, but there are still some other non-spacebar items not | |
| included in this list. Here are the "special" items: | |
| * The Sad Onion | |
| * The Inner Eye | |
| * Spoon Bender | |
| * Max's Head | |
| * My Reflection | |
| * Number one | |
| * Blood of the Martyr | |
| * Brother Bobby | |
| * Magic Mushroom | |
| * Raw Liver | |
| * Cupids arrow | |
| * Steven | |
| * Pentagram | |
| * Moms Eye | |
| * Distant Admiration | |
| * Dr Fetus | |
| * Wiggle Worm | |
| * Sister Maggy | |
| * Technology | |
| * Growth Hormones | |
| * Lokis Horns | |
| * Spider Bite | |
| * Lil Chubby | |
| * The Small Rock | |
| * Super Bandage | |
| * Robo-Baby | |
| * Little Gish | |
| * Little Steve | |
| * The Halo | |
| * The common cold | |
| * The Parasite | |
| * The Wafer | |
| * Money = Power | |
| * Moms Contacts | |
| * Ouija Board | |
| * Stigmata | |
| * Speed Ball | |
| * Prayer Card | |
| * Ipecac | |
| * Tough love | |
| * The Mulligan | |
| * Technology 2 | |
| * Chemical peel | |
| * Bloody Lust | |
| * Epic Fetus | |
| * Daddy longlegs | |
| * Fate | |
| * The Black Bean | |
| * Sacred Heart | |
| * Tooth Picks | |
| * Holy Grail | |
| * Dead Dove | |
| * Guppys Hairball | |
| * SMB Super Fan! | |
| * Pyro | |
| * 3 Dollar bill | |
| * Jesus Juice | |
| * If it is *not* a special item, then you get that item | |
| * If it *is* a special item, there is a chance that it will be re-rolled, | |
| equal to `1 - 1/(1.2 + special * 3)` | |
| * `special` is a counter that starts at 0 | |
| * Every time you pick up a special item above, if you did not get it | |
| from a deal with Satan, add 1 to `special` | |
| * For some reason, My Reflection only adds 0.2 to `special` instead of 1 | |
| * So basically, these special items become more rare the more of them you | |
| pick up. Below represents the chance that an item in the above list is | |
| re-rolled, assuming that you already have `n` items from the list. | |
| * 0: 0.17 | |
| * 1: 0.76 | |
| * 2: 0.86 | |
| * 3: 0.90 | |
| * 4: 0.92 | |
| * 5: 0.94 | |
| * 6: 0.95 | |
| * 7: 0.95 | |
| * 8: 0.96 | |
| * 9: 0.96 | |
| * Most pools can be exhausted. When this happens, either the first pool is used, | |
| or, in the case of the Boss/Boss Challenge Rooms pool, the Secret Room pool, | |
| and the general-purpose pool (for non-room re-rolled items and beggars) it | |
| bugs out and gives you `undefined` (flickers through every item). | |
| * The Library and the Angel Room never lose items from their pool. | |
| * If you deplete item pool 1 to less than 6 items remaining, all 10 pools | |
| will be refreshed to random initial states as they were when the game | |
| started. This does not change what you already picked up. | |
| ### Incidental item pool removal | |
| All items are stored as numbers, that is, you can have 0 of something, or 1, or | |
| -14, or 3.14, and those are all valid. However, when checking which items are | |
| available to you (i.e., those that you have not picked up yet), it simple checks | |
| to see if it is not 0. This means that some items will be automatically | |
| prevented from showing up through interaction with other items. The following | |
| lists these. | |
| * Health Up/Down: `<3` | |
| * Speed Up/Down: Wooden Spoon | |
| * Tears Up/Down: Wire Coat hanger! | |
| * Range Up/Down: Moms Lipstick | |
| * Finishing an Eternal Heart: Lunch | |
| * Dead Cat: Dinner | |
| * Sacred Heart: Spoon Bender | |
| * Ipecac: The Inner Eye | |
| * Polyphemus: The Inner Eye | |
| * Mutant Spider: The Inner Eye | |
| * Spirit of the night: Ouija Board | |
| * Dead Dove: Ouija Board | |
| * Making a deal with Satan: Lunch | |
| * Pretty Fly through slots or pill: Halo of Flies | |
| * `unknown`: Bum friend | |
| ### Item Pools | |
| * Pool 1 (Item Room?) | |
| * The Sad Onion | |
| * The Inner Eye | |
| * Spoon Bender | |
| * Max's Head | |
| * My Reflection | |
| * Number one | |
| * Blood of the Martyr | |
| * Brother Bobby (x2) | |
| * Halo of Flies | |
| * Magic Mushroom | |
| * The Virus | |
| * Roid Rage | |
| * `<3` | |
| * Boom! (x2) | |
| * Wooden Spoon | |
| * The Belt | |
| * Moms Underwear | |
| * Moms Heels | |
| * Moms Lipstick | |
| * Mr. Boom! | |
| * Tammys Head | |
| * Moms Bra | |
| * kamikaze! | |
| * Moms Pad | |
| * Teleport! | |
| * Doctors Remote | |
| * Cupids arrow | |
| * Shoop da Whoop! | |
| * Magneto | |
| * Moms Eye | |
| * Lemon Mishap | |
| * Distant Admiration | |
| * Book of shadows | |
| * Wiggle Worm | |
| * Charm of the vampire | |
| * Anarchist Cookbook | |
| * The Hourglass | |
| * Sister Maggy | |
| * Chocolate Milk | |
| * Growth Hormones | |
| * Mini Mush | |
| * Rosary | |
| * PHD | |
| * Xray-Vision | |
| * My little Unicorn | |
| * Deck of Cards | |
| * Ouija Board | |
| * Odd Mushroom (Large) | |
| * Odd Mushroom (Small) | |
| * Dead Sea Scrolls | |
| * Bobby - Bomb | |
| * Forever alone | |
| * Bucket of Lard | |
| * Best Friend | |
| * Remote Detonator | |
| * Stigmata | |
| * Bobs Curse | |
| * Scapular | |
| * Speed Ball | |
| * Bum friend | |
| * Infestation | |
| * Ipecac | |
| * Tough love | |
| * The Mulligan | |
| * Technology 2 | |
| * Mutant Spider | |
| * Chemical peel | |
| * The Peeper! | |
| * Bloody Lust | |
| * Crack the Sky | |
| * Ghost Baby | |
| * Harlequin baby | |
| * Polyphemus | |
| * Mitre | |
| * Portable Slot! | |
| * Holy Water | |
| * The Black Bean | |
| * Tooth Picks | |
| * 3 Dollar bill | |
| * Telepathy for Dummies | |
| * D20 | |
| * Celtic cross | |
| * Abel | |
| * Sacrificial Dagger | |
| * Rainbow Baby | |
| * Blood Rights | |
| * SMB Super Fan! | |
| * Spider Butt | |
| * Daddy longlegs | |
| * Guppys Hairball | |
| * Skeleton Key (1/2 chance) | |
| * The Necronomicon (2/3 chance to be in either pool 7 (additional 1/3 chance), otherwise | |
| here) | |
| * Technology (4/5 chance) | |
| * The Book of Belial (1/3 chance and not Judas) | |
| * Yum Heart | |
| * Lucky Foot (2/3 chance) | |
| * A Quarter (2/3 chance) | |
| * Dr Fetus | |
| * The Poop! | |
| * Spelunker Hat | |
| * Monstros Tooth | |
| * Lokis Horns | |
| * Lil Chubby | |
| * The Relic | |
| * Sack of pennies | |
| * Robo-Baby | |
| * The Gamekid | |
| * The Book of Sin (2/3 chance) | |
| * Little Gish | |
| * Little Steve | |
| * Little Chad | |
| * The Halo | |
| * Moms Bottle of Pills | |
| * The common cold (2/3 chance) | |
| * The Parasite (2/3 chance) | |
| * The Dice | |
| * Mr. Mega | |
| * The Pinking Shears | |
| * The Wafer | |
| * Money = Power (2/3 chance) | |
| * Moms Contacts | |
| * The Bean | |
| * Dead Bird | |
| * Guardian Angel | |
| * Bomb Bag | |
| * Moms Knife (2/3 chance) | |
| * Whore of Babylon (2/3 chance) | |
| * Razor Blade (2/3 chance) | |
| * Demon Baby (2/3 chance) | |
| * Forget Me Now (2/3 chance) | |
| * Monster Manuel (2/3 chance) | |
| * NOTE: If under 5 items remain in pool 1, all pools are refreshed as they | |
| were in the beginning | |
| * Pool 2 (Boss Room?) | |
| * Lunch | |
| * Dinner | |
| * Dessert | |
| * Breakfast | |
| * Rotten Meat | |
| * One of: | |
| * Wooden Spoon | |
| * The Belt | |
| * Two of: (could be duplicates) | |
| * Moms Underwear | |
| * Moms Heels | |
| * Moms Lipstick | |
| * Wire Coat hanger! | |
| * Pentagram | |
| * Pageant Boy | |
| * Cat-o-nine-tails | |
| * Stem cells | |
| * MEAT! | |
| * Magic 8 ball | |
| * Moms coin purse | |
| * Squeezy | |
| * Jesus Juice | |
| * BOX | |
| * Super Bandage (2/3 chance) | |
| * NOTE: Remove the first occurance of all of the above from Pool 1 | |
| * Pool 3 (Secret Room?) | |
| * 1up! (1/2 chance for x2) | |
| * Raw Liver | |
| * Bobs Rotten Head | |
| * My Little Unicorn (1/2 chance for x2) | |
| * Ankh | |
| * Pyro (1/2 chance) | |
| * Dad's Key | |
| * Epic Fetus | |
| * We need to go deeper (1/3 chance to be in pool 7, otherwise 1/2 chance to be | |
| here) | |
| * Book of Belial (1/3 chance to be in pool 1, otherwise 1/2 chance to be here) | |
| * Transcendence (2/3 chance) | |
| * Spider Bite | |
| * Pool 4 (Shop Room?) | |
| * Treasure Map (x2) | |
| * The Ladder (x2) | |
| * Steam Sale | |
| * The Compass (x2) | |
| * Mom's Purse | |
| * Habit | |
| * Notched Axe | |
| * Mom's Coin Purse | |
| * Bum Friend (1/2 chance) | |
| * Portable Slot! (if not Bum Friend) | |
| * The Candle | |
| * 9 Volt (1/2 chance) | |
| * The Battery (1/2 chance) | |
| * Book of Revelations | |
| * NOTE: Remove the first occurance of all of the above from Pool 1 | |
| * Pool 5 | |
| * Nonexitent? | |
| * Pool 6 (Golden Chest?) | |
| * Tammy's Head | |
| * One of: | |
| * Wooden Spoon | |
| * The Belt | |
| * One of: | |
| * Mom's Underwear | |
| * Mom's Heels | |
| * Rotten Meat | |
| * The Sad Onion | |
| * Steven | |
| * Fate (1/2 chance) | |
| * NOTE: Remove the first occurance of all of the above from Pool 1 | |
| * Pool 7 (Devil Room?) | |
| * Brother Bobby | |
| * Sister Maggy | |
| * The Mark | |
| * The Pact | |
| * Dead Cat | |
| * Ouija Board | |
| * Brimstone | |
| * Guppy's Paw | |
| * Guppy's Head | |
| * Guppy's Tail | |
| * Spirit of the Night | |
| * Bloody Lust | |
| * The Necronomicon (2/9 chance) | |
| * Technology (1/5 chance) | |
| * Lord of the Pit (1/3 chance) | |
| * We need to go deeper! (1/3 chance) | |
| * Book of Belial (1/3 to be in pool 1, otherwise 1/2 chance to be in pool 3, | |
| otherwise here) | |
| * Lucky Foot (2/3 chance to be in pool 1, otherwise here) | |
| * The Nail (2/3 chance) | |
| * A Quarter (2/3 chance to be in pool 1, otherwise here) | |
| * The Book of Sin (2/3 chance to be in pool 1, otherwise here) | |
| * The Common Cold (2/3 chance to be in pool 1, otherwise here) | |
| * The Parasite (2/3 chance to be in pool 1, otherwise here) | |
| * Money=Power (2/3 chance to be in pool 1, otherwise here) | |
| * Moms Knife (2/3 chance to be in pool 1, otherwise here) | |
| * Whore of Babylon (2/3 chance to be in pool 1, otherwise here) | |
| * Razor Blade (2/3 chance to be in pool 1, otherwise here) | |
| * Demon Baby (2/3 chance to be in pool 1, otherwise here) | |
| * Forget Me Now (2/3 chance to be in pool 1, otherwise here) | |
| * Monster Manuel (2/3 chance to be in pool 1, otherwise here) | |
| * Pool 8 (Challenge Room?) | |
| * Rotten Meat | |
| * Skeleton Key | |
| * Boom! | |
| * The Compass | |
| * Teleport! | |
| * Growth Hormones | |
| * The Virus | |
| * Roid Rage | |
| * Pool 9 (Library) | |
| * Book of Shadows | |
| * Anarchist Cookbook | |
| * Telepathy for Dummies | |
| * The Necronomicon (2/3 chance) | |
| * The Book of Belial (if not Judas) | |
| * Book of Revelations | |
| * The Book of Sin | |
| * Monster Manuel | |
| * Note: Items are *never* removed from this pool. | |
| * Pool 10 (Angel Room?) | |
| * Blood of the Martyr | |
| * The Bible | |
| * The Halo | |
| * Prayer Card | |
| * Scapular | |
| * Mitre | |
| * Sacred Heart | |
| * Holy Grail (1/2 chance for x2) | |
| * Dead Dove | |
| * The Relic | |
| * Guardian Angel | |
| * Note: Items are *never* removed from this pool. | |
| ### Specific Items | |
| #### Dead Sea Scrolls | |
| * On use, uses one of the following items: | |
| * The Book of Belial | |
| * The Necronomicon | |
| * Mr. Boom! | |
| * Tammys Head | |
| * Moms Bra | |
| * kamikaze! | |
| * Moms Pad | |
| * Bobs Rotten Head | |
| * Teleport! | |
| * Yum Heart | |
| * Lemon Mishap | |
| * Shoop da Whoop! | |
| * Book of shadows | |
| * Wiggle Worm | |
| * Anarchist Cookbook | |
| * The Hourglass | |
| * My little Unicorn | |
| * Book of Revelations | |
| * the Nail | |
| * We need to go deeper! | |
| * Deck of Cards | |
| * Monstros Tooth | |
| * The Gamekid | |
| * The Book of Sin | |
| * Moms Bottle of Pills | |
| * The Pinking Shears | |
| #### The Bible | |
| * Using The Bible on the chapter 9 boss (Satan or Isaac) will deal 1000 damage | |
| to the player. According to player damage mechanics, if you have any spirit | |
| hearts or The Wafer, you can survive this. | |
| #### Dead Cat | |
| * If ???, your spirit hearts are set to 1 | |
| * Otherwise, you get negative `Dinner` items until you have 1 heart | |
| * Sets `?ups[81]` to 8 | |
| * `?catlives = 1` | |
| #### Ipecac | |
| * If you don't have Inner Eye, sets it to 0.5(?) | |
| #### Polyphemus | |
| * If you don't have Inner Eye, sets it to 0.3(?) | |
| #### Mutant Spider | |
| * If you don't have Inner Eye, sets it to 0.4(?) | |
| #### Rosary | |
| * Augments the 4th (shop?) item pool with The Bible x 7 | |
| #### 9 Volt | |
| * Instantly recharges current item on pickup | |
| #### Spirit of the Night | |
| * Gives Ouija Board | |
| #### Dead Dove | |
| * Gives Ouija Board | |
| #### Guppy's Hairball | |
| Each floor, `size = round(size * 0.5 + 0.5)`, lower bounded at 1 | |
| #### Dr. Fetus | |
| * Augments the item pool with | |
| * Bobby - Bomb x 6 | |
| * Mr. Mega x 6 | |
| #### Sacred Heart | |
| * Gives Spoon Bender | |
| #### Monster Maneul | |
| * Gives one of the following for the room (will not pick one that you already | |
| have): | |
| * Brother Bobby | |
| * Cube of Meat (Can pick either the 2nd or 3rd form) | |
| * Halo of Flies | |
| * Distant Admiration | |
| * Sister Maggy | |
| * Lil Chubby | |
| * Robo-Baby | |
| * Little Gish | |
| * Little Steve | |
| * Guardian Angel | |
| * Demon Baby | |
| * Forever alone | |
| #### 3 Dollar Bill | |
| * One of the following random effects each room: | |
| * The Sad Onion | |
| * The Inner Eye | |
| * Spoon Bender | |
| * My Reflection | |
| * Number One | |
| * Lucky Foot | |
| * Magneto | |
| * Mom's Contact | |
| * Ouija Board | |
| * Speed Ball | |
| * Tough Love | |
| ## Slots | |
| Unfortunately a lot of this logic appears to be attached to the animation | |
| itself, which makes it impossible for me to see with the source I am currently | |
| using. | |
| ### Skull Game | |
| * 4 items (heart, coin, bomb, key) with equal chance | |
| * If coin, you get 2-4 | |
| * Otherwise, you get 2 | |
| * If you do not have Skatole, 1/13 chance each time to see it | |
| * 1/3 chance to win, plus extra 1/3 chance if you have Lucky Foot | |
| ### Slot Machine | |
| * Start with a random roll | |
| * With Lucky Foot: 3 - 17 | |
| * Without: 3 - 23 | |
| * If `roll >= 9` and 9/10 chance or `?sloto`: `roll++` | |
| * If `roll == 7` and 1/3 chance: `roll = 10` | |
| * Check your roll | |
| * 3: | |
| * 1/3 chance for Pretty Fly | |
| * Otherwise black fly(?) | |
| * 4: Bomb | |
| * 5-6: `5` (?) | |
| * 7: Key | |
| * 8: Pill | |
| * 9: A dollar! | |
| * 10-12: Coins x(1-3) | |
| * Otherwise: fail | |
| ### Fortune Machine | |
| * Chance to get a random fortune | |
| * 0.65 chance normally | |
| * 0.00 with Lucky Foot | |
| * Otherwise, 1/20 chance to explode | |
| * Otherwise, 1/30 chance to get Crystal Ball | |
| * Otherwise, 1/3 chance to get a card | |
| * Otherwise, 1/3 chance to get a spirit heart | |
| * Otherwise, you get a trinket | |
| ### Blood Donation Machine | |
| * 1/15 chance to break | |
| * Otherwise you get 1-3 coins (+1 coin if you have PHD) | |
| * When it breaks, you normally get the Blood Bag, but there is a 1/2 chance to | |
| get the IV Bag if you do not have it already. | |
| ### Beggars? | |
| * `.col == 31` (devil beggar?) | |
| * 1/2 chance to... | |
| * 1/2 chance to get a pill | |
| * Otherwise you get a card | |
| * Otherwise... | |
| * 1/4 chance to get a trinket | |
| * Otherwise you get a random item | |
| * Otherwise (normal beggar?) | |
| * 1/2 chance to... | |
| * 1/3 chance to get a `5` | |
| * Otherwise you get a key or bomb | |
| * Otherwise | |
| * 1/2 chance to... | |
| * 1/2 chance to get one of the following: | |
| * Lunch | |
| * Dinner | |
| * Dessert | |
| * Breakfast | |
| * Rotten Meat | |
| * Otherwise, you get a card | |
| * Otherwise, you get a random item | |
| ## Rooms and Floors | |
| ### Spawning | |
| * Number of rooms: 5 + chapter * 2.6 + random(0-1), upper bounded at 20 | |
| * Curse of the Labyrinth: x1.8 rooms | |
| * Big floor: +4 rooms | |
| (This part is still being investigated) | |
| Note: You have "full hearts" if your hearts plus spirit hearts equals more | |
| than your maximum hearts. | |
| * Sacrifice Room: 1/7 chance, plus additional 1/4 chance if you have full hearts | |
| * Library: 1/20 chance, plus additional 1/4 chance if `?bookster` | |
| * Curse Room: 1/2 chance, plus additional 1/4 chance if `?lastdev` (you have | |
| visited the devil in this run?) | |
| * Miniboss: 1/4 chance, plus additional 1/3 chance on the first chapter | |
| * Challenge Room: Full hearts, not the first chapter, and 1/2 chance if it's the | |
| second chapter (automatic otherwise) | |
| * Arcade: At least 5 coins, and an even chapter number (second floor) | |
| ### Clearing a Room | |
| * When determining the chance to get a drop after you clear a room, you start | |
| with a random floating point number between 0 and 1. | |
| * If you have the Lucky Foot item, `chance = chance * 0.9 + 0.1` | |
| * If your luck is positive, `chance = chance * 0.9 + 0.1` | |
| * If your luck is negative, `chance = chance - luck * 0.1` | |
| * Woah, woah. Luck is negative, but you're subtracting it from chance. | |
| That means your chance goes **up** the more negative luck you have! | |
| * If you have Lucky Toe | |
| * ...and Lucky Foot and positive luck stat, `chance = chance * 0.98 + | |
| 0.02` | |
| * but not both of the above, `chance = chance * 0.9 + 0.1` | |
| * Something something trinkets to determine drop `trixies(false)` | |
| * If you have Guppys Tail | |
| * 1/3 chance to guarantee either a brown chest or gold chest with equal | |
| probability | |
| * Otherwise, 1/3 chance to guarantee you get nothing | |
| * If you have Isaac's Fork, 1/10 chance to gain a half heart | |
| * Item boosting trinkets (1/10 chance each): | |
| * Ace of Spades: random card | |
| * Safety Cap: random pill | |
| * Match Stick: bomb | |
| * Rusted Key: | |
| * 1/2 chance to get gold chest | |
| * Otherwise you get a key | |
| * Child's Heart: heart | |
| * If you didn't get one of the above, check to see where your chance lies to see | |
| what you get | |
| * If it is below 0.22, you get nothing | |
| * YOU LOSE. GOOD DAY SIR. | |
| * If it is between 0.22 and 0.30 | |
| * 1/3 chance to get a card | |
| * Otherwise 1/2 chance to get trinket | |
| * Otherwise you get a pill | |
| * If it is between 0.30 and 0.45, you get a coin | |
| * If it is between 0.45 and 0.60, you get a heart | |
| * If it is between 0.60 and `0.8 - chapter * 0.01`, you get a key | |
| * If it is between `0.8 - chapter * 0.01` and 0.95, you get a bomb | |
| * If it is above 0.95, you get a brown chest | |
| * So, to analyze the above... | |
| * Negative luck actually gives you a higher chance to receive an item, | |
| though I'm fairly sure it is a bug. More negative luck will, however, push | |
| your chances of getting a card/trinket/pill off the table. | |
| * As you continue through the chapters, the chance to see a key decreases, | |
| while the chance to see a bomb increases. | |
| ### Super Secret Rooms | |
| #### Types | |
| 1. Heart pickups | |
| 2. One half Eternal Heart | |
| 3. One Trinket | |
| 4. One Red Chest | |
| 5. Fortune Teller Machine | |
| ### Devil Rooms | |
| The following conditions are required to have a devil room "spawn" (unsure when spawn is determined, exactly) | |
| * Chapter is between 2 and 8. The following cannot have devil rooms | |
| * Basement/Cellar 1 | |
| * Cathedral | |
| * Sheol | |
| * Chest | |
| * `?devil != 3` (This is set when the conditions fail, which probably means that | |
| you can't reroll a chance at the devil if you don't get it the first time. | |
| However, this is reset in multiple places, so TBD). | |
| * 1/x chance or `?satan`. Chance is determined as follows: | |
| * Base chance starts at 0.01 | |
| * If you have the Pentagram item, add 0.20 chance | |
| * If you have a second Pentagram (somehow), add 0.10 chance | |
| * If you are holding Book of Belial, add 0.25 chance | |
| * If you are holding Book of Revelations, add 0.35 chance | |
| * If you killed a "bum" at all this game, add 0.35 chance | |
| * If `?bossdmg`, add 0.35 chance | |
| * `?bossdmg` is set true when you start the game | |
| * `?bossdmg` is set false when you get hurt, if: | |
| * You have no spirit hearts | |
| * `f2 <= 200` (Certain damage sources don't count?) | |
| * If `?devil`, add 0.99 chance | |
| * If the last devil room you've seen was on the previous floor, multiply the | |
| chance by 0.25 | |
| * If the last devil room you've seen was two floors ago, multiply the | |
| chance by 0.5 | |
| Additionally, Krampus will spawn in the devil room with a 1/10 chance, plus an | |
| additional 1/3 chance if you made a deal with the devil already. He will not | |
| spawn more than once. | |
| ### Angel Rooms | |
| The following 3 conditions must be true for a Devil Room to spawn as an Angel | |
| Room instead (note the spawn conditions still rely on the above Devil Room | |
| conditions) | |
| * 1/2 chance | |
| * You did not make any deals with the devil | |
| * A devil room "spawned" at least once (Interesting note: This variable is not | |
| reset, so if you see a devil room in one game, you can start another game and | |
| see an angel room as early as your second floor.) | |
| #### Deals with the Devil | |
| * 1/5 chance that the item costs 3 spirit hearts | |
| * Otherwise, the following items cost 2 heart containers and all others in item | |
| pool 7 cost only 1 heart container | |
| * The Mark | |
| * The Pact | |
| * Lord of the Pit | |
| * the Nail | |
| * Dead Cat | |
| * Demon Baby | |
| * Whore of Babylon | |
| * Brimstone | |
| * Bloody Lust | |
| * Spirit of the night | |
| * Guppys Head | |
| * If you have Judas' Tongue, the above items cost 1 heart container, but those | |
| that cost 3 spirit hearts will still cost as much. | |
| * If the item costs 3 spirit hearts and you do not have at least that many, you | |
| cannot take it. | |
| * If the item costs heart containers | |
| * Your maximum hearts is reduced by the cost | |
| * You suffer damage equal to `cost - max_hearts_before + current_hearts` | |
| * Because your spirit hearts are not removed but are restored, you will | |
| not suffer damage and thus cannot die if you have any spirit hearts | |
| * If you do not have spirit hearts and have heart containers equal to or | |
| less than the deal, you will die from damage. Two notes: | |
| * In the Womb and beyond, you always take 1 heart of damage, which | |
| may kill you. | |
| * If you have the Wafer, you will always take 0.5 hearts of damage. | |
| This item can actually get you killed when you otherwise would be | |
| safe. | |
| * If you have non-negative hearts, your spirit hearts will be restored to | |
| what they were before the deal | |
| * If you are negative on heart containers, your spirit hearts are stripped | |
| and you are dealt 10 damage. It almost seems like you shouldn't survive | |
| this, but fortunately they forgot to reset your grace period, so the | |
| damage you took before makes you invincible to this 10 damage, and you | |
| survive. At this point, you can still bring yourself out of negative | |
| hearts by picking up enough health up items. | |
| ### Mini-boss Rooms | |
| * Seven Sins | |
| * Drop rate on items: | |
| * If "super" version: 1/7 | |
| * Otherwise: 1/28 | |
| * Otherwise, you get the pickup listed first | |
| * Sloth | |
| * Card | |
| * Bobs Rotten Head | |
| * (Super) Bobs Curse | |
| * Lust | |
| * Pill | |
| * The Virus | |
| * (Super) Yum Heart | |
| * Wrath | |
| * Bomb | |
| * Mr. Boom! | |
| * (Super) Mr. Mega | |
| * Gluttony | |
| * Heart | |
| * `<3` | |
| * (Super) Bucket of Lard | |
| * Greed | |
| * Coins (x4-8) | |
| * Steam Sale | |
| * (Super) A Quarter | |
| * Envy | |
| * Troll Bomb | |
| * Shoop da Whoop! | |
| * (Super) Forever alone | |
| * Pride | |
| * Card | |
| * Anarchist Cookbook | |
| * (Ultra) Dead Cat (bugged to get Pill instead?) | |
| * Greed has a chance to spawn in the... | |
| * secret room if: | |
| * You are in chapter 5 or greater | |
| * 1/3 chance | |
| * shop room if: | |
| * You are in chapter 4 or greater | |
| * 1/(6 - chapter) chance | |
| * Chapter 4: 1/2 chance | |
| * Chapter 5-6: 100% chance | |
| * Greed will not spawn in one of these rooms if | |
| * a mini-boss room is already picked | |
| * he spawned in one of these in the previous chapter **N.B.** XL floors, | |
| particularly Depths/Necropolis XL count as two chapters ahead, so this | |
| part will not apply | |
| * he spawned in the other of these two rooms | |
| ### Boss Rooms | |
| * The Fallen has 1/10th chance to spawn if a Devil Room has spawned before | |
| * If you use Book of Revelations and you're on a non-XL floor in Womb or before, | |
| you will get one of the four horseman as your boss. | |
| * Normal boss selection procedure: | |
| * 1/5 chance to get one of the four horseman respective to your level | |
| * If you got a horseman from random selection or Book of Revelations, 1/10 | |
| chance to get The Headless Horseman instead | |
| * Otherwise, if you're on Womb/Utero 1 with 1/3 chance: | |
| * 1/2 chance to get `38` | |
| * Otherwise `41` | |
| * Otherwise, if you've visited the devil at some point, 1/10 chance to get | |
| The Fallen | |
| * Otherwise, if you're on Womb/Utero 1 with 1/3 chance, you get either `30` | |
| or `33` with equal chance | |
| * Otherwise, if you're on the second floor of Cellar or Catacombs with 1/4 | |
| chance: | |
| * 1/2 chance to get | |
| * Cellar: `28` | |
| * Catacombs: `36` | |
| * Otherwise | |
| * Cellar: `32` | |
| * Catacombs: `27` | |
| * Otherwise, if you're on the first floor with 1/5 chance: | |
| * Basement/Cellar: `13` | |
| * Caves, Catacombs: `14` | |
| * Depths, Necropolis: `15` | |
| * Womb, Utero: `16` | |
| * Otherwise, if you are on the 3rd chapter or Cellar with 1/4 chance: | |
| * Cellar: `13` | |
| * Caves, Catacombs: `14` | |
| * Otherwise, for chapters 1-3 with 1/2 chance: | |
| * Basement 1: `2` | |
| * Basement 2: `3` | |
| * Caves 1: `4` | |
| * Cellar 1: `37` | |
| * Cellar 2: `29` | |
| * Catacombs 1: `26` | |
| * Otherwise | |
| * Basement 1: `1` | |
| * Basement 2: `2` | |
| * Caves 1: `3` | |
| * Caves 2: `4` | |
| * Depths 1: `5` | |
| * Womb 1: `7` | |
| * Cellar 1: `34` | |
| * Cellar 2: `37` | |
| * Catacombs 1: `29` | |
| * Catacombs 2: `26` | |
| * Necropolis 1: `30` or `35` | |
| * Utero 1: `31` | |
| ### Curses | |
| * You cannot get a curse on 11th chapter (chest) | |
| * 1/x chance to get Curse of the Labyrinth if applicable (first floor of chapter) | |
| * 1/2x chance to get Curse of the Lost | |
| * 1/2x chance to get Curse of Darkness | |
| * x = | |
| * 80 when you start playing | |
| * 30 after you kill Mom | |
| * 10 after you unlock Everything is Terrible | |
| * 5 after you complete Cathedral on one character | |
| * So, a fully unlocked game has a | |
| * 1/5 chance to get Curse of the Labyrinth (when applicable) | |
| * ~1/10 chance to get Curse of the Lost | |
| * ~9/100 chance to get Curse of Darkness | |
| ## Objects | |
| ### Red Chest | |
| * 1/10 chance to get one of the following items: | |
| * Dead Cat | |
| * Guppys Tail | |
| * Guppys Paw | |
| * Guppys Head | |
| * The Mark | |
| * If you already have the item or did not get the roll, you have a 1/18 chance | |
| to be teleported to the Devil or Angel room | |
| * Otherwise, you have a 1/5 chance to spawn 2 spiders | |
| * Otherwise, you have a 1/5 chance to spawn a super troll bomb | |
| * Otherwise, you have a 1/5 chance to get 3 blue flies | |
| * Otherwise, you get a random choice of: | |
| * 2 pills | |
| * 2 troll bombs | |
| * 2 spirit hearts (1/2 chance to get only 1) | |
| ### Brown Chests, Gold Chests, and Tinted Rocks (?) | |
| This is really confusing, sorry! A lot of these are unknown items, and the | |
| process is really random. I'm also not sure where spirit hearts come in with | |
| respect to tinted rocks, since they obviously drop a lot. | |
| * First you roll how many pickups you will get | |
| * `frame 8` and `.col == 1`: 1-2 pickups (brown chest?) | |
| * `frame 6`: 1-8 pickups (min 2) (gold chest?) | |
| * Otherwise: 1-4 pickups (min 2) (tinted rock?) | |
| * 2/3 chance | |
| * Check trinkets to see if you will get a pickup (see "Clearing a Room" | |
| under "Item boosting trinkets") | |
| * If you have Lucky Toe or got an extra pickup above, add +1 to your pickups | |
| * Starting at 0, loop until you pass your pickup number | |
| * If you had a trinket proc for an extra item, you get that immediately | |
| * Otherwise | |
| * You get treasure (an actual item) if | |
| * It is the first time in the loop (so that means using one of the | |
| bonus item trinkets prevents objects from yielding treasure!) | |
| * One of the following rolls: | |
| * 1/10 chance if it is a rock (`?trg == 2`?) | |
| * 1/5 chance if it is `frame 6` (gold chest?) | |
| * If you didn't get treasure, 1/5 chance on a non-rock to... | |
| * `frame 6`: you get a card | |
| * Otherwise (brown chest only?) you get a pill | |
| * Another 1/2 chance to get a trinket in addition to either | |
| * If you got either of the two above treasures, you stop | |
| * Otherwise, roll a random floating point number from 0-1... | |
| * For chests | |
| * 0.00 to 0.35: 1-3 coins | |
| * 0.35 to 0.55: `5` | |
| * Additional 1/2 chance to get -1 pickup | |
| * 0.55 to 0.70: you get a key | |
| * 0.70 to 0.71: (first loop only) you get a brown chest and you stop | |
| * 0.71 to 0.72: (first loop only) you get a gold chest and you stop | |
| * 0.72 to 1.00: you get a bomb | |
| * For tinted rocks | |
| * 0.00 to 0.60: `5` | |
| * Additional 1/2 chance to get -1 pickup | |
| * 0.60 to 0.70: you get a key and you stop | |
| * 0.70 to 0.71: (first loop only) you get a brown chest and you stop | |
| * 0.71 to 0.90: (first loop only) you get a gold chest and you stop | |
| * 0.90 to 1.00: you get a bomb | |
| * If `frame 8` and `.col == 1` (brown chest bonus loot?) | |
| * 1/2 chance: 1-4 coins | |
| * Else, you get `5` | |
| ### Tinted Rocks | |
| * Each room has a random number rolled from 65 to 180 (range of 115). This | |
| number corresponds to a specific tile, the top-left being 48 and the | |
| bottom-left being 191. If there is a rock on the randomed tile, then it | |
| becomes a tinted rock. | |
| * You can assume that the chance that there is a tinted rock in any given room | |
| is `number_rocks / 115`, excluding the rocks from the first and last row(?). | |
| ### Poop | |
| * Info about golden/rainbow poop spawning goes here | |
| ## Misc | |
| ### Challenge modes | |
| 1. Pitch Black | |
| * No special starting items | |
| * End stage: Floor 6 (Mom's Foot / Depths 2) | |
| * No shops | |
| * 100% Curse of Darkness | |
| 2. High Brow | |
| * Starting Items: Butt Bombs, Number One, E. Coli, FLUSH! | |
| * End stage: Floor 6 (Mom's Foot / Depths 2) | |
| * No item rooms | |
| * Start with Petrified Poop trinket. | |
| 3. Head Trauma | |
| * Starting Items: Tiny Planet, Soy Milk, Iron Bar, Small Rock | |
| * End stage: Floor 6 (Mom's Foot / Depths 2) | |
| * No item rooms | |
| 4. Darkness Falls | |
| * Starting Items: Razor Blade, Dark Matter, Pentagram, Sacrificial Dagger | |
| * End stage: Floor 9 (Isaac / Cathedral) | |
| * No item rooms | |
| * Start as Eve | |
| * Required achievements: Eve character unlocked, It Lives unlocked (10 Mom's Heart kills) | |
| 5. The Tank | |
| * Starting Items: Thunder Thighs, Bucket of Lard, Infamy | |
| * End stage: Floor 6 (Mom's Foot / Depths 2) | |
| * No item rooms | |
| * Start as Maggy | |
| * Required achievements: Maggy character unlocked | |
| 6. Solar System | |
| * Starting Items: Distant Admiration, Forever Alone, Halo of Flies, Transcedence | |
| * End stage: Floor 8 (Mom's Heart / Womb 2) | |
| * No item rooms | |
| * Required achievements: Transcendence item unlocked (Beat Mom's Heart 3 times) | |
| * Blindfold item (Isaac can't shoot) | |
| 7. Suicide King | |
| * Starting Items: IPECAC, My Reflection, Mr. Mega | |
| * End stage: Floor 9 (Isaac / Cathedral) | |
| * No item rooms | |
| * Start as Lazarus | |
| * Required Achievements: It Lives unlocked (10 Mom's Heart kills), Lazarus character unlocked. | |
| 8. Cat Got Your Tongue | |
| * Starting Items: Guppy's Tail, | |
| 9. Demo Man | |
| * | |
| 10. Cursed! | |
| * | |
| 11. Glass Cannon | |
| * | |
| 12. When Life Gives You Lemons | |
| * | |
| 13. BEANS! | |
| * | |
| 14. Its In The Cards | |
| * | |
| 15. Slow Roll | |
| * | |
| 16. Computer Savy | |
| * | |
| 17. WAKA WAKA | |
| * | |
| 18. The Host | |
| * | |
| 19. The Family Man | |
| * | |
| 20. The Purist | |
| * | |
| ### Everything is Terrible | |
| * Increased chance to get a curse | |
| * Less heart drops from bosses | |
| * Other effects go here | |
| ### Other notes | |
| ## Credits |
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