Use the arrow keys to move your character around, but, sometimes, you will split, if this happens if one of the characters finishes the level - it goes to the next level, but if one character dies, it counts as a death.
I was originally going to make a race between two people (one using the arrow keys and another using WASD) but then I realized that that wasn't going to work (think about it...) I was testing the game and well, this happened :)
