Kakurenino

Kakurenino is a three-dimensional deduction game. Each player has a set of wooden blocks made up of wooden squares; the pieces are different colors and both players have the same set of pieces. In addition to the basic cubes, there are "decoy" cubes. Simultaneously, each player builds a 2 or 3 dimensional structure using their pieces. Optionally, they can include some decoy blocks. When both players are ready, they stare at their opponent's structure trying to deduce which pieces their opponent did not use. If you have correctly guessed within the time allowed, you win!