Cannibal Clobber is played on a two-dimensional board and has very simple rules:
Red and Black move in turn.
Only capture moves (=clobbers) are allowed. A stone may capture any other piece - let it be enemy or friend - in his 4-neighbourhood: north, east, south, and west.
A player unable to capture loses.
 
Cannibal Clobber evolved from the more classical game "Clobber". In Clobber you may capture only enemy stones. The name Cannibal Clobber indicates that a player may eat also his own pieces.
 
The Zillions implementation comes with three different board sizes - 5x4, 6x6, 8x8 - and two sorts of setup: a completely regular one and one where the starting configuration is generated at random. Human chances against Zillions are the better the larger the board.