Castlevania: The Adventure is a platform game released for the Game Boy in 1989. It is the first Castlevania title for the system. Castlevania: The Adventure was re-released in color as part of the Konami GB Collection compilations in Japan and Europe. A remake titled Castlevania: The Adventure ReBirth was released as a WiiWare game for the Wii. The original game is included in the Castlevania Anniversary Collection, which was released in 2019.
Set a century before the events of the original Castlevania, the player controls an ancestor of Simon Belmont named Christopher Belmont who goes on a quest to defeat Count Dracula.
The game consists of four stages, and unlike other Castlevania games, there are no sub-weapons, but hearts are used to restore health. The player has three lives, after which the player must restart the level. Weapons can be upgraded, such as the whip into the chain whip and flame whip, but any enemy damage will downgrade an upgraded weapon. At the end of each level, there is a "primary evil" to confront. Players can utilize crystals, hearts, and crosses of gold. There is a point counter, and at 10,000 points, a player receives an extra life, and receives one for every 20,000 points after that. Each stage has a time limit in which to complete the level.