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 3V3, 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.

• Umbrella Corps on Wikipedia.
• Umbrella Corps on Moby Games.

• Tips on the Resident Evil website.
• Boot Camp - More tips and techniques on the re website.