Doom engine

The Doom engine refers to the core sections of the Doom source code. The phrase may at times refer to the Doom rendering engine; however, the rendering engine is only a part of the overall engine.

The Doom engine has been used for several commercial games:
 * Amulets & Armor (1997)
 * Chex Quest (1996)
 * Chex Quest 2 (1997)
 * HacX (1997)
 * Heretic (1994)
 * Shadow of the Serpent Riders
 * Hexen: Beyond Heretic (1995)
 * Hexen: Deathkings of the Dark Citadel (1996)
 * Strife - Quest for the Sigil (1996)