SEVEN is a tile-stacking game that uses polyhexes of 4 hexagons, called tetrahexes. There are 7 different tetrahexes (hence the name of the game). Players alternate turns placing one of their tiles according to some simple rules, trying to get the most of their pieces on the topmost layers when the game ends. The rules also include a variant and some puzzles. SEVEN is the little brother of Pent-Up, Counterplays and Stack-22.