A basic implementation of the game "snake" on an arduboy.

Snake_arduboy.ino

#include <Arduboy2.h>



Arduboy2 arduboy;

boolean gameStarted = false;
int x, y;
byte snake[11][2];
byte last_move;
byte food_x, food_y;
boolean died = false;
byte counter = 0;

void setup() {
  arduboy.begin();
  arduboy.setFrameRate(1);
  x = 20;
  y = 10;
  arduboy.clear();
  arduboy.setTextSize(3);
  arduboy.setCursor(x, y);
  arduboy.print("Snake");
  arduboy.setTextSize(0.1);
  arduboy.setCursor(x - 15, y + 30);
  arduboy.print("Snake it or break it");
  arduboy.display();
}
//128 by 64

void loop() {

  

  if (!arduboy.nextFrame())
  {
    return;
  }
  if (arduboy.pressed(B_BUTTON) && !gameStarted) {
    arduboy.clear();
    arduboy.display();
    gameStarted = true;
    /*
    for (int i = 0; i <= 10; i++) {
      snake[i][0] = -1;
      snake[i][1] = -1;
    }*/
    snake[0][0] = 6;
    snake[0][1] = 6;
    snake[1][0] = 5;
    snake[1][1] = 6;
    snake[2][0] = 4;
    snake[2][1] = 6;
    food_x = random(0, 31);
    food_y = random(0, 15);
    last_move = 3;
  }
  if (!gameStarted) {
    return;
  }
 

  for (int i = 10; i > 0; i--) {
    /*
      temp_x = snake[i + 1][0];
      temp_y = snake[i + 1][1];
      snake[i + 1][0] = snake[i][0];
      snake[i + 1][1] = snake[i][1];
    */
    int x = i - 1;
    if ((snake[i][0] < 255) && (snake[i][0] > 0)) {
      snake[i][0] = snake[x][0];
      snake[i][1] = snake[x][1];

    }



  }


  if (arduboy.pressed(UP_BUTTON) && !(last_move == 1)) {
    snake[0][1] -= 1;
    last_move = 0;
  } else if (arduboy.pressed(DOWN_BUTTON) && !(last_move == 0)) {
    snake[0][1] += 1;
    last_move = 1;
  } else if (arduboy.pressed(LEFT_BUTTON) && !(last_move == 3)) {
    snake[0][0] -= 1;
    last_move = 2;
  } else if (arduboy.pressed(RIGHT_BUTTON) && !(last_move == 2)) {
    snake[0][0] += 1;
    last_move = 3;
  } else if (last_move == 0) {
    snake[0][1] -= 1;
    last_move = 0;
  } else if (last_move == 1) {
    snake[0][1] += 1;
    last_move = 1;
  } else if (last_move == 2) {
    snake[0][0] -= 1;
    last_move = 2;
  } else if (last_move == 3) {
    snake[0][0] += 1;
    last_move = 3;
  }



  arduboy.clear();

  

  if ((snake[0][0] == food_x) && (snake[0][1] == food_y)) {
    counter++;
    food_x = random(0, 32);
    food_y = random(0, 16);
    //add on to the snake
    int i = 10;
    while (snake[i][0] <= 0) {
      i--;
    }
    if ((snake[i][0] == snake[(i - 1)][0]) && (snake[i][1] == (snake[(i - 1)][1] + 1))) {
      //arduboy.print("a");
      snake[(i + 1)][0] = snake[i][0];
      snake[(i + 1)][1] = snake[i][1] - 1;
    } else if ((snake[i][0] == snake[(i - 1)][0]) && (snake[i][1] == (snake[(i - 1)][1] - 1))) {
      //arduboy.print("b");
      snake[(i + 1)][0] = snake[i][0];
      snake[(i + 1)][1] = snake[i][1] + 1;
    } else if ((snake[i][0] == (snake[(i - 1)][0] + 1)) && (snake[i][1] == snake[(i - 1)][1])) {
      //arduboy.print("r");
            snake[(i + 1)][0] = snake[i][0] + 1;
      snake[(i + 1)][1] = snake[i][1];
    }
     else if ((snake[i][0] == snake[(i - 1)][0] - 1) && (snake[i][1] == snake[(i - 1)][1])) {
      //arduboy.print("l");
            snake[(i + 1)][0] = snake[i][0] - 1;
      snake[(i + 1)][1] = snake[i][1];
    }
  }
  

arduboy.print(counter);

  drawSnake();

  for (int i = 1; i < 10; i++) {
    if ((snake[0][0] == snake[i][0]) && (snake[0][1] == snake[i][1])) {
       die();
    }

  }

  if (!(arduboy.collide(Rect(snake[0][0] * 4, snake[0][1] * 4, 4, 4), Rect(0, 0, 128, 64)))) {
    die();
  }

arduboy.display();

  /*
    if (arduboy.pressed(UP_BUTTON)) {
    arduboy.invert(true);
    arduboy.audio.off();
    } else if (arduboy.pressed(DOWN_BUTTON)) {
    arduboy.invert(false);
    arduboy.audio.on();
    }
    die();
  */
}

void die() {
    x = 15;
  y = 15;
    gameStarted = false;
  died = true;
  arduboy.clear();
  arduboy.invert(true);
  arduboy.setTextSize(2);
  arduboy.setCursor(x, y);
  arduboy.print("You Died");
  arduboy.setTextSize(1);
  arduboy.setCursor(x + 25, y + 30);
  arduboy.print("Snek sad");
  arduboy.display();

  for (int i = 0; i < 11; i++) {
    snake[i][0] = 0;
    snake[i][1] = 0;
  }

  counter = 0;
  
    snake[0][0] = 6;
    snake[0][1] = 6;
    snake[1][0] = 5;
    snake[1][1] = 6;
    snake[2][0] = 4;
    snake[2][1] = 6;
    last_move = 3;
    arduboy.invert(false);

if (arduboy.pressed(B_BUTTON)) {
  died = false;
  //setup code
    x = 20;
  y = 10;
  arduboy.invert(false);
  arduboy.clear();
  arduboy.setTextSize(3);
  arduboy.setCursor(x, y);
  arduboy.print("Snake");
  arduboy.setTextSize(0.1);
  arduboy.setCursor(x - 15, y + 30);
  arduboy.print("Snake it or break it");
  arduboy.display();
}

}

void drawSnake() {

  arduboy.drawRect(food_x * 4, food_y * 4, 4, 4, WHITE); 
  //arduboy.drawRect(x*4, y*4, 4, 4, WHITE);
    for (int i = 0; i < 10; i++) {
    if ((snake[i][0] == 255) || snake[i][0] == 0) {
      return;
    }
    arduboy.drawRect(snake[i][0] * 4, snake[i][1] * 4, 4, 4, WHITE);
  }
}