Schattenmonster is a memory game. In the basic version, players take turns flipping open pairs of tiles - matching pairs can be kept, others are flipped back. Pairs consists of a monster picture on a colored background and its shadow on a grey background. In the advanced rules, flipping open certain monsters without finding the matching tile immediately leads to special actions, such as everyone passing the collected pairs to the left, to the right, or re-shuffling the remaining tiles. The first two effects can be used tactically as well. The player with most pairs is the winner.