Algodoo

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Okay, first I must say this game makes no sense.
Idea of this game is to destroy others computer. You need a friend when you play this, becouse this is 1 vs 1. When game starts, you must attack with your mouse. Mouses can't break, but computers and computer screens can. You can move the computer to dodge attacks, but you can use mouse to block them. This game doesn't actually have rules, but here's ways how to fail. First, if your mouse looses from the computer you fail. You can also fall down or turn to immobilized if your tires break. Last, if you're smashed to pieces you fail.
Player 1 controls (left computer)
Moving: WASD
Attack: IJKL

Player 2 controls (right computer)
Moving: arrow keys
Attack: 8456 (numpad)

Controls are in the game if you forget them, but they're easy to remember.
Have fun!