You must read all, or you can't play. Space to start playing. Purple likes arrow keys, but Green has always preferred WASD. Don't touch the red dots. There are two ways to win. Complete the mazes, or get enough points. To gain points, touch the green and yellow dot. You lose points for any contact with the red and yellow dot. Purple is the one with purple, and Green has green on it (Duh!). This is a multi-player game, but you could leave one to die and play with the other sprite.
Beware: Purple and Green will overlap each other. Just move one of them to find the other.