Frozen Bubble

Frozen Bubble is an open-source Puzzle Bobble clone.

In each level, the rectangular playing area contains a different pattern of colored bubbles. At the bottom of the screen is Tux, the Linux penguin, who is being controlled by the player. As Tux, he operates a machine that fires new bubbles up the screen in a chosen direction. These bubbles travel in straight lines, possibly bouncing off the walls of the playing area, until they are stopped by other bubbles. As soon as three bubbles of the same color touch each other, they fall off the screen, along with any bubbles hanging only from them. At regular times, the ceiling of the playing area is lowered, leaving less room to put new bubbles. If any existing bubbles pass the bottom of the playing area before it is completely empty, it's game over.

The game contains 100 handmade levels. It is also possible to play a randomly generated level or create one yourself with the built-in level editor.