KBounce (executable kbounce) is a KDE Bounce Ball Game written in 2000 by Stefan Schimanski which is included in Kdegames.
 The Setup
You're playing in a field which is surroneded by a wall with balls bouncing off the walls. You're supposed to fill the entire screen by dividing the area, and any area with no balls is covered. You win by covering 75% of the field. It's kind of fun, at least for 10 minutes or so.