Games like Hazard Ops on Steam
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Guns and Robots
Guns and Robots is free to play online third person shooter. The game brings robot action with massive customization. Players get cartoony bright 3D graphics in attractive environments and challenge each other in open arenas.
SAS: Zombie Assault 4
Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.
Zombie Army 4: Dead War
Hitler’s hordes are back for more in this spine-chilling shooter from the makers of Sniper Elite 4! Abominable occult enemies, epic weapons and a harrowing new campaign for 1-4 players await in 1940s Europe, as you fight to save humankind from undead Armageddon!
Zombie Panic! Source
Dive into the zombie apocalypse with Zombie Panic! Source: a cooperative, survival-horror first-person-shooter. A fast-paced standalone modification.
GunZ 2: The Second Duel
GunZ 2: the Second Duel is a free-to-play 3D TPS and is the most fast-paced tough action shooter game.
BrainBread 2
Grab a weapon, demolish your enemies, level up, become more powerful, let the gore flow, let the limbs fly. BrainBread 2 introduces a zombie fps mixed with RPG / Arcade elements, the game is very action-packed and generally fast-paced.
Zombie Army Trilogy
The cult horror shooter series comes to an apocalyptic conclusion with an epic new third chapter, a heart-pumping new horde mode, and remastered editions of the best-selling Nazi Zombie Army 1 & 2.
Transmissions: Element 120
TE120 is a short single player experience set in the Half-Life Universe featuring a gravity defying weapon that allows you to jump buildings and sustain large falls. The story takes place at a mysterious date & location. Where are you? Why have you been sent?
No More Room in Hell
The chances of you surviving this all out war of society and the undead are slim to none. Already, there are millions of the walking dead shambling about, searching for food to eat. There's no known cure. One bite can possibly end it all for you. However, you aren't alone in this nightmare.
World War Z
World War Z is a heart-pounding coop third-person shooter for up to 4 players featuring massive swarms of hundreds of zombies, focused on fast-paced, gruesomely spectacular action.
FPS Game: Dev Test
A Simple, Fun, Multiplayer FPS game, strictly built and packaged for development testing and networking development.
Alien Swarm
Co-operative multiplayer game and complete code base available for free.
Light Bearers
Light Bearers is a multiplayer asymmetrical hide and seek game that pits a sinister shadow against cute light bears!
Sniper Elite: Nazi Zombie Army
** Please note: a remastered and improved edition of this game is now available in Zombie Army Trilogy.**Featuring a co-op campaign for 1 to 4 players, Nazi Zombie Army is a horrifying new stand-alone expansion of the award-winning Sniper Elite series.
The Haunted: Hells Reach
Winner of 2010′s Make Something Unreal contest, The Haunted: Hells Reach is a fast-paced horror game where your goal is to liberate cursed places and survive the assault of Hell.
Double Action: Boogaloo
Double Action is a free stylish multiplayer game about diving, flipping, and sliding your way into action movie mayhem.
Strange Brigade
Embark on an exotic journey into danger in this rip-roaring 1930s third person adventure for 1-4 players! Encounter pulse-pounding action, treacherous traps and tales of derring-do!
Resident Evil 6
Blending action and survival horror, Resident Evil 6 promises to be the dramatic horror experience of 2013.
Sniper Elite: Nazi Zombie Army 2
** Please note: a remastered and improved edition of this game is now available in Zombie Army Trilogy.**Experience a terrifyingly intense co-op campaign for up to four players in this gut-wrenching sequel to Steam best-seller, Sniper Elite: Nazi Zombie Army.
WARMODE
Free to play shooter about the confrontation of two irreconcilable sides, represented by the government military housings and the armed hirelings. Try your hand at virtual battles with off-scale dynamics and hurricane gameplay in the spirit of the classical shooters.
Resident Evil 5
This game is a port of the Games for Windows - Live version that was released in 2009. If you buy the Untold Stories Bundle here on Steam, it will be the same as upgrading to Resident Evil 5 Gold Edition.
Gear Up
Feel the adrenaline as you control your unique tank in multiplayer arcade action! Build your ultimate war machine from over a million different combinations. Now, will you go for the rumbling caterpillar tracks or the crawling spider legs?
Rogue Company
Join 20+ million players in Rogue Company, the ultimate third-person tactical action shooter! Become an agent of Rogue Company and wield powerful weapons, high-tech gadgets, and game-changing abilities. Accept the mission and jump into a variety of 4v4 and 6v6 game modes. Play FREE today!
SYNTHETIK: Arena
Face the varied challenges of the Machine God Zir in ARENA, a standalone expansion for Synthetik: Legion Rising! Leverage the next level in gun-play and experiment with powerful tech in varied action packed Arenas!
APB Reloaded
The world’s first and premier Action MMO Third Person Shooter allows you to choose between two sides of the law. Play as Enforcer or Criminal, customize your gear for the task at hand and hit the streets and play how you want in a city filled with more action this side of a Hollywood blockbuster.
Dead Maze
Dead Maze is a 2D MMO game set in a destroyed contemporary world, filled with zombies. Explore the world, scavenge and craft as many items as possible, to survive the hostile environment and upgrade your gear and camp as you go.
Robocraft
Build insane, fully customisable robot battle vehicles that drive, hover, walk and fly in the free-to-play action game Robocraft. Add weapons from the future and jump in the driving seat as you take your creation into battle against other players online!
死寂（Deathly Stillness）
This is a boring zombie game with no plot, not an officially released game, please don't have high expectations.
Of Guards And Thieves
Of Guards and Thieves is a multiplayer stealth game in which high-powered guards face off against fast and elusive thieves in a contest of wits. Outsmarting the enemy and shooting your way through to the goal are equally valid strategies. Simple rules, emergent gameplay and high replayability.
Countersnipe
Multiplayer Seek and Snipe
Call of Duty®: Black Ops III
Call of Duty®: Black Ops III Zombies Chronicles Edition includes the full base game plus the Zombies Chronicles content expansion.
Counter-Strike Nexon
Counter-Strike Nexon is a Free to Play MMOFPS offering competitive PvP and PvE action including content from the original Counter-Strike and all new game modes, map creation function, weapons, and hordes of Zombies!