The Doom engine is the game engine that powers the id Software games Doom and Doom II, as well as Raven Software's titles Heretic and Hexen, then finally wrapping its final commercial license with Rogue Entertainment's Strife. It is a sector-based engine, with 2D sprites representing objects, enemies and everything else that's not the map.
This is a factory themed, limit-removing Doom 2 MAP01 level (with custom music for source ports that support .mp3) that is set on Earth. The goal is to reach the interior of the Icon of Sin chamber, marked clearly on the factory floor. Conceptually, this is a complex and sprawling map, and similar to Doom 2's The Citadel in that not all keys are required for exiting. To keep the map from overwhelming the player, numerous holographic signs are used to denote specific areas, such as STORAGE, WASTE PROCESSING or RESTROOMS. This, along with new graphics and a dose of Doom cute, are intended to suggest realism while maintaining Doom's maze-like tendencies. GRAPHICS SOURCES: Sonic 3 and Knuckles, Sonic CD, Duke Nukem 3D, Blood, Shadow Warrior. KNOWN BUGS: A couple of the textures don't render correctly in Crispy Doom.
Cool!