Jon

 
const int LIGHT_PIN = 9;
const int BUTTON_PIN = 5;
const int DIFFICULTY = 5;
 
int ledSequence[DIFFICULTY];
 
/**
 * In this mode, the game shows the user a sequence to copy
 */
void speak() {
    generateSequence();
    
    for(int ii = 0 ; ii < DIFFICULTY ; ii ++) {
        int led = ledSequence[ii] + LIGHT_PIN;
        digitalWrite(led, HIGH);
        delay(1000);
        digitalWrite(led, LOW);
        delay(200);
    }
    
}
 
/**
 * In this mode, the game listens to the user to see if they got the sequence right
 */
void listen() {
    
    int fail = 0;
    int succeed = 0;
    int ii = 0;
    
    while( !fail && !succeed) {
        int button = listenForButton();
        if(button != ledSequence[ii]) {
            fail = 1;
        } else {
            ii++;
        }
        if(ii > DIFFICULTY) {
            succeed = 1;
        }
    }
    
    if(fail) {
        showFailure();
    } else {
        showSuccess();
    }
    
}
 
/*
 * Flash all the LEDS
 */
void showFailure() {
    for(int count = 0 ; count < 10 ; count ++ ) {
        for(int ii = 0 ; ii < 4 ; ii++ ) {
            digitalWrite(ii, HIGH);
        }
        delay(100);
        for(int ii = 0 ; ii < 4 ; ii++ ) {
            digitalWrite(ii, LOW);
        }
        delay(100);
    }
}
 
/*
 * Cylon the LEDS
 */
void showSuccess() {
   
   for(int count = 0 ; count < 10 ; count ++) {
        // Cycle up 
        for(int ii = 0 ; ii < 4 ; ii++) {
            int led = LIGHT_PIN + ii;
            digitalWrite(led, HIGH);
            digitalWrite(led - 1, LOW);
            delay(100);
        }
        // Cycle down
        for(int ii = 0 ; ii < 4 ; ii++) {
            int led = LIGHT_PIN + (3 - ii);
            digitalWrite(led, HIGH);
            digitalWrite(led + 1, LOW);
            delay(100);
        }
       
   }
}
 
int listenForButton() {
    
    int button = -1;
    
    while(button == -1) {
        for(int ii = BUTTON_PIN ; ii < BUTTON_PIN + 4 ; ii++ ) {
            int push = digitalRead(ii);
            if(push == HIGH) {
                button = ii;
            }
        }
    }
    int pressed = 1;
    while(pressed) {
        pressed = (HIGH == digitalRead(button));
    }
    
    return button;
}
 
void generateSequence() {
    for(int ii = 0 ; ii < DIFFICULTY ; ii++ ) {
        int number = random(0, 4);
        ledSequence[ii] = number;
    }
}
 
void setup() {
    randomSeed (analogRead (0)); 
    for (int ii = LIGHT_PIN ; ii < LIGHT_PIN + 4 ; ii++) {
        pinMode(ii, OUTPUT);
    }
    
    for (int ii = BUTTON_PIN ; ii < BUTTON_PIN + 4 ; ii++) {
        pinMode(ii, INPUT);
    }
}
 
void loop() {
    
    // First of all, show the user a sequence
    speak();
    // Then wait for them to follow it
    listen();
}