Captain Blood is an open-source engine and full source code release for the Captain Blood game, a hack-and-slash action-adventure title based on Rafael Sabatini's novels about the titular Captain Blood in the 1685 Spanish Main. Originally developed by 1C: Seawolf Studio, this project allows players and developers to experience and modify the game, following the Captain's adventures through sword combat, exploration, and story-driven gameplay. The engine supports the game's action-adventure mechanics, including combat systems, character interactions, and the maritime setting. It is licensed under GPL-3.0, encouraging community contributions and modifications. The project includes support resources through a community Discord for developers interested in extending or studying the codebase. This release serves both as a preservation effort for the original game and as a foundation for potential new content, fan projects, or engine research in 3D action-adventure game development.