Here's what i could think of, each map would be a floor of the tower, these floors are very large, there are 8 sections to fight through to get to the next floor, you need to search for find access code notes (new keycard items) to get to the control room which leads you out of the floor, in some maps, you'll have bosses to fight, there will be a map where there will be a mini boss and then a 1-section map where you must face the boss