Each player controls colored mice and tries to collect pieces of cheese in Castle Appenzell. On their turn, players spend action points to put new mice into play, reveal corridors in the castle, or move their mice; then they push a tile, which changes the maze and can possibly move mice around. If two mice reach a place with the same kind of cheese, the player obtains a piece of this cheese. The first player with 4 different pieces of cheese wins the game.
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