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Umbrella Corps is a multiplayer-focused, _Mercenaries_-like spin-off from the Resident Evil series.
You play as generic Umbrella goofs fitted with 'Zombie Jammers'—backpacks capable of keeping zombies from attacking you—duking it out in 3-v.-3, PVP matches. Movement is much quicker than the proper _Mercenaries_ modes/games, and you are given a bunch more options for moving and interacting with the environment.
It has a really cool door opening mechanic D:
It has a really fun online logo designer, and other customisation is pretty nice too.
Rounds are quick.
So it moving while crawling.