Bounce!

Ne*****

Big square with 4 bouncing balls inside the big square. Every time a ball bounces against one of the walls, a marker is produced. Too many markers on one side, and the game is over. You clear the markers by tapping an arrow key on your keyboard, then the markers for the corresponding side clears. Problem is the balls start bouncing faster and faster, and you have to press the correct arrow keys faster and faster to clear the markers. If markers for any of the four sides fill up, that's the end of the game. Also, if you hit the arrow key for a side that doesn't yet have any markers, the game ends, so hitting arrow keys willy nilly doesn't work. The longer you can keep the game going, the higher the score. For me, the bouncing got too fast too quickly, and I couldn't get over 100.