Blood

Caleb was once a feared gunslinger, until he met a woman who was involved with a mysterious cult known as Cabal. Caleb, too, is sucked in, and soon becomes one of the Chosen - the most favored worshippers of the evil god Tchernobog. But one day, Tchernobog inexplicably kills the four Chosen, including Caleb. Mysteriously resurrected years later, Caleb is out to get revenge, and learn why his lord cast him down so abruptly.

Blood is a first-person shooter with horror elements, which uses the Build engine. Similarly to Duke Nukem 3D, the environment is interactive: many objects can be physically moved or affected in other ways. Destruction of landscapes is possible (although only in specific spots), with bullet holes being left by misplaced shots. The Build engine version is 2.5D, so there are rooms above rooms and puzzles which are based on this.