Castlevania II: Belmont's Revenge is a platform game released for the Game Boy in 1991. It is the second Castlevania title for the Game Boy and serves as a sequel to the previous title, Castlevania: The Adventure. The game features four initial levels, each taking place in a separate castle with a unique theme such as air, plant, earth, and crystal, and can be completed in any order. The game utilizes a password system. The North American version of the game changes one of the sub-weapons, replacing the cross with an axe. The game has seen a re-release for the Castlevania Anniversary Collection in 2019.