In the puzzle and platform game The Castle the player controls a prince that has to save the princess. To find his princess he must explore the castle, which has a hundred different rooms. Each room is a puzzle on its own as the prince must avoid enemy knights, fat Tiroler men, hazardous objects and has to use objects to get to the next door. In each room the prince has to collect keys and items, such as rings, gold bars and bottles. The bottles will give the prince an additional life. The keys may have different colors and only opens doors with the corresponding key color.