The object of the game is to place pieces so that they form a row of four. The row may be in any direction, may cross the 'planes' to produce a row which for example goes from the bottom right corner to the top left corner. Play can be for two players or one person against the computer. When play is against the computer, the machine will use a sophisticated, fast logic search to produce a superb mental challenge.
GNU Chess is a free software chess engine which plays a full game of chess against a human being or other computer program. The goal of GNU Chess is to serve as a basis for research. It has been used in numerous research contexts.
The game has no real narrative. The introduction simply places the player in the role of an unnamed explorer who must delve into a subterranean labyrinth to locate 11 hidden treasures and return them to the surface.