Help! I've got the yellow key card but it's not letting me open this door. Ive opened it before but it won't let me get back in. The level is E2M4. Any
E3M7: Gate to Limbo - Gamer Walkthroughs
Doom/E3M7: Limbo — StrategyWiki | Strategy guide and game reference wiki
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Steam Community :: Guide :: Secrets for Episode 3: Inferno