Catrap is a puzzle game. The player directs the avatar, an anthropomorphic cat, to navigate a room while clearing obstacles and kicking monsters and ghosts off the screen. Once the player has knocked all of the enemies off the screen, they advance to the next level. Advancement grows difficult for the player as increasingly intricate obstacles are presented to complicate the process of overcoming all of the monsters and ghosts. The game encourages trial and error. Players can also create their own mazes. There are 100 levels for the player to clear, each one more difficult than the last with more room for error and typically take longer to complete.