Icebreaker is a puzzle/shooter that has the player take control of a flying pyramid who has to navigate through 150 levels blasting other stationary pyramids. The stationary pyramids are either green, blue or red and can turn into each others colors throughout a level. The red pyramids can be destroyed by being shot, the blue pyramids are destroyed by being touched, and the green pyramids are destroyed by luring enemy pyramids into them.
Speaking of enemy pyramids, each enemy pyramid has their own abilities:
Orange pyramids have the ability to morph
Purple pyramids can dig pits that can trap the player
Green pyramids are very smart and can outwit the player
Yellow pyramids are very fast and maneuverable
There are also many different environments to play in such as ice fields, swamps, lava pits and bottomless pits, four different difficulty settings to choose from that range from easy to insane and eighteen different music tracks that can be changed during the game.
The Mac and Windows versions of the game shipped with an easter egg game, Icebreaker: The Text Adventure by Andrew "Zarf" Plotkin, who was working on the Mac port (shortly after completing A Change in the Weather), re-casting the game's gameplay dynamics in text adventure idiom, eg.:
You are in a pleasant grassy meadow. To the north, south, east, northeast, southeast, and southwest is a meadow; to the west and northwest is seething lava.
A red pyramid stands to the north.
A green pyramid stands to the south.
A blue pyramid stands to the east.
The text adventure level consists of a 6x6 play field containing 14 pyramids which must be destroyed. A deeper analysis of this hidden game can be found here.