Press space to start, and use the asdfghjkl keys to press the black tiles. If one of them goes off the screen or you press the wrong one you lose. The game starts off slow, but gradually gets faster. The difficulty is the number of spaces a tile can be, 4 is the normal amount. The higher the difficulty, the faster the score goes up. If the difficulty is under 4, you cannot set the world high score. You also cannot set the world high score if using a song code, because the song could be too easy. To make a song code you can type in the numbers from 1 to whatever the difficulty is. 1 is the farthest one to the left, a 2 is the one right next to that, and so on.
