Blood

Blood is a first-person shooter built on the Build engine, incorporating horror themes and a detailed, interactive world. Its levels are structured as four distinct episodes, each requiring the player to navigate a series of maps in sequence to confront a final boss. The environments often resemble realistic, albeit twisted, locations such as carnivals, city streets, and moving trains.

The player controls Caleb, a former gunslinger betrayed and killed by the evil deity he once served, who returns from death seeking vengeance. Progression through the game's levels involves locating keys and activating switches to reach an exit, a process that is challenging due to numerous hostile encounters. Adversaries include cultists, reanimating zombies, hell-hounds, and other monstrous creatures.

Combat utilizes a wide arsenal, ranging from conventional firearms like shotguns and tommy guns to more unusual tools such as a flare gun, a tesla cannon, and a voodoo doll. The game emphasizes violent and gory feedback, with enemies reacting dynamically to damage and environmental destruction being possible in certain areas. Defense is managed through a health system based on collecting "Life Essences" dropped by foes and through specialized armor that protects against different damage types.

Various power-ups are scattered throughout the levels, some providing immediate effects like invisibility while others, such as jumping enhancements, can be stored for later use. The game's mechanics, including its 2.5D engine allowing for multi-leveled puzzles, contribute to a detailed and interactive experience focused on exploration and combat.