After escaping the burning wreckage of the Kridonea Ruins, Commander Keen must descend into the ancient sewer system below the city and find his way through. This labyrinth of doors, tunnels, and putrid pools of waste is deadly and confusing, and it can be quite easy to become hopelessly lost. There are tales of Krile citizens who wandered into the Catacombs only to get lost and never return, their restless spirits are cursed to wander the tunnels forever looking for the way out.
Several robots have found their way into these tunnels including Atroxians, Atroxites, Axosis, and Axoclaw. Keen should also beware the hungry maw of the Beetlebones which lurk in the sewage pools, waiting to pounce and devour anything that passes by.
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