I would have to say (no offense) this game was to easy, BUT! I was unable to stop playing it was fun, i was able to finish killing everyone without loosing any health, COMMENT THIS UP! to surive put a machine gun rocket launcher and sniper (most exspensive gun) in each elevator. (i found this to be the most fun on the last level you will have to move around though so be ready to move your guy also not everything needs to be upgraded but make sure you have one really strong elevator for back up) THIS WORKED FOR ME COMMENT UP IF YOU LIKE THIS!
 "Air Pressure")
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 "Wentworth")
 "Survival of the Fittest")
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 "Scene of the Crime: Golden Doll")
 "The Next Floor")
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 "Chess"){kind=icon}
 "Full Moon")
 "Axion RPG")
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Oh haider.