81 is an Essen 2006 release for Steffen Spiele. Following in their normal vein, it is an abstract game with multiple game variations. The board is a square of wood with a 9x9 grid of holes drilled in it. These are divided into nine quadrants, and thus with the nine differently colored pegs one can play "color sudoku" or one of three other games included. Great quality like all the other Steffen-Spiele games.