- Use your arrow keys to move the tiles.
- When two tiles with the same number (say X) touch, they merge into one tile with the number 2X and your score is reduced by 2X.
- You start the game with a score of 512. You lose when your score goes below 0.
- You win when there are no more moves left i.e. when the board is completely filled, and it is not possible to move any tile.