http://store.steampowered.com/app/514990/Outbreak/
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STEAM KEY REGION FREE GLOBAL

Explore a nightmarish environment, scrounge for supplies, and battle the undead in Outbreak -- an online co-op/offline survival horror game. The clock never stops as you attempt to manage an extremely limited inventory with a murderous horde on the hunt. Choose between acquiring additional weapons, healing items, or necessary tools for progression. You have only one life. Make it count!

Friendly play: 4-player online co-op multiplayer featuring voice chat.
Cut the cord: All modes playable in offline single-player with pause support.
Campaign Mode: Play the entire story alone or in up to 4-player co-op!
Nightmares Mode: Narrative hardcore single-player story mode.
Onslaught Mode: Fight waves of endless enemies alone or with friends!
Offline backup: Optional Partner AI bot in solo Campaign & Onslaught modes.
Dark atmosphere: Explore a deserted hospital infested by the undead.
Brutal difficulty: Your character only has a single life; includes 3 difficulty settings.
Limited inventory: Decide which items are worthy, and which should be left behind.
Expansive arsenal: Defend yourself with a multitude of firearms and melee weapons.
Challenging puzzles: Scour each room to solve puzzles and learn about the outbreak.
High replayability: Semi-random enemy and item layouts make every playthrough unique.
Distinct survivors: Seven playable heroes with unique attributes and starting equipment.
Essential equipment: Earn during play and trade with other players.
Play your way: Customizable gamepad, mouse and keyboard controls.
Worldwide multiplayer: Cloud-based backend with region selector means no NAT issues.