In this abstract strategy with transparent- tetris-shaped- colored pieces players try to get rid of all their pieces. The only caveat to placing a piece is that it may not lie adjacent to your other pieces. Instead you must place your pieces at the vertices of your pieces already on the board. Supports up to 4 players. In the single player version you try to get rid of all the pieces in a single sitting. WARNING: Choking Hazard - Small Parts. Not for Children under 3 yrs.