Chocolate Castle is a simple yet innovative sliding block puzzle game. The relatively simple gameplay combined with the pixelated graphics and chiptune music gives it a retro-style feel.

The object of the game is to eat all of the chocolate blocks in a room. Click and drag an animal onto a chocolate block, and it will eat all of the connecting chocolate blocks of the same type. There are four different animals; a bear, a dog, a bunny and a pig. Each animal can only eat a certain chocolate type; brown (bear), dark-brown (dog), white (bunny) and pink (pig).