THE CITADEL is a hardcore, brutal old-school shooter full of action that’s a throwback to the 90’s classics that we all love. Fight through 6 Episodes of 30 action-packed levels (and an additional 6 secret levels). here is a guide for the secret levels for you.
Map list (no spoilers)
If you just want to know where
the entrances are but leave the how
to yourself, here are the maps: