The guys at Apogee were keenly aware when making this game that there was no way they could top Doom, so instead of going for something with a serious tone they decided to stand out in a different way: By being as LUDICROUS as possible! Also, random level generator and massive array of multiplayer game modes. This wasn't a "Doom-killer" but it managed to co-exist with Doom surprisingly well given the relative simplicity of its underlying game engine.