PC (Microsoft Windows)31 грудня 2005 р.
Випущено ✓ 
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The Singularity Complex
Singularity Complex is an episode of 9 levels for Ultimate Doom, done in the "classic" Doom style. It is the successor of the much acclaimed Classic Episode, so I guess you could also call it Classic Episode 2.
ActionShooter
Перспектива гравця
First person