Just use the arrow keys to move the balls. Just a tip, make sure the 2 balls don't touch because it triggers a GAME OVER. Also, make sure nether ball touches a grey ball. If the ball pops out of nowhere in your face to quickly, it'll get deleted (I added that because I HATE IT when that happens to me in some other game). If some of the grey balls get deleted randomly or are popping up randomly, don't worry about it. Click the green flag to restart. The goal us to stay alive as long as possible. Have fun!
