Dungeon of Mystery
Dungeon of Mystery is a custom level for Keen 1 by Perry Scanlon released 2003-12-15. There are two level files in the zip, the second level is the same than the first, but without monsters and hazards. This is an extremely tricky door puzzle. Not every keycard has to be picked up, and not every door can be opened.
Level Data and Map
Spoiler Warning! This shows the whole level.