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Catalyst features a mix of elements: there are two types of currency for the in-game weapon & upgrade systems, three monster arenas (which are all fairly difficult), with random monster spawns between arena bouts to keep you on your toes. You can play it with respawns enabled, or - if you're a total masochist - you can play it in survival mode for a massive point increase... basically it's like a single-player (or co-op) training facility.
More info → http://imgur.com/a/s3JFs
Map ID → [Z9TRNVZU]