Click the green flag to start. If you want to be the cat, press the right arrow to go right, the up arrow to go up, the left arrow to go left. If you want to be the crab, press the a key to go left, the d key to go right, and the w key to go up. The crab does not have terminal velocity so if you have a little sibling, I recommend that him/her uses the crab. The cat is much harder.
This is the modified version of Arctic Cat. Some improvements have been made; it is multiplayer.