Pox

Pox is a clone of Tetris but with balls instead of bricks. The objective is to connect four or more balls of the same color to create matches and play as long as possible until the stack of balls reaches the red line at the top.

There are 80 levels and several bonuses affecting the gameplay, like clearing the bottom lines or changing ball colors. Controls consist of the left and right arrow keys to position the balls and the Ctrl key to rotate them.