Top similar games like Counter Operation Online:

Black Ops Cold War, the direct sequel to Call of Duty®: Black Ops, will drop fans into the depths of the Cold War’s volatile geopolitical battle of the early 1980s.

Call of Duty®: Vanguard includes a deeply engaging single player Campaign, a massive Multiplayer offering featuring over 20 maps including 16 built for core Multiplayer and an exciting new Zombies experience developed by Treyarch.

Fittest is a semi-realistic military looter-shooter where you are tasked with entering zones and looting the items needed for your survival. Choose to be stealthy and avoid combat or go loud! The choice is yours! Regardless of the path you choose, you will need to be the fittest to survive!

Black Squad is a free-to-play military first-person-shooter. Players can master their skills and show off their strategies with a wide range of game maps, modes, and weapons to choose from. Join thousands of FPS players worldwide in one of the most played games on Steam!

CAM is a fps that has PvP action and a cooperative zombie survival mode, featuring a body camera perspective and realistic graphics. Wishlist and share CAM with friends! Send us proof of wishlist to apply for a exclusive beta access and to test upcoming updates!

Condition Zero,Where you can play multiplayer and frag players or play zombies and survive wave of zombies.

In the direct sequel to the record-breaking Call of Duty®: Modern Warfare® II, Captain Price and Task Force 141 face off against the ultimate threat.

Total Havoc is a fast paced FPS game that offers loads of fun across many maps and modes. A true must play for all FPS enthusiasts. Where FPS meets two worlds and teleportation amongst them. Rotating the fighting.

A.V.A is a classic FPS shooter game featuring various types game Modes. Depending on the battlefield, you can choose Pointman, Rifleman, and Sniper and enjoy strategic team play.

Embrace unrivaled destruction in Battlefield 4™. Revel in the glorious chaos of all-out war packed with rewarding, tactical challenges in an interactive environment.

The doom of humanity arrives as chemists and scientists experiment with the genetic codings and structurings of all living things, ending up with unwanted infiltrators smuggling into the secret premises, obtaining the powerful genetic-altering chemical mixture that leads to ultimate terrorism.

Flykt is a 4 player online co-op game which players will try to escape from an abandoned hospital. Players will able to choose to play as teams or as impostors to kill their friends. Flykt environment will be generated procedurally. Be silent, move stealth or get killed.

Blood Strike is a free FPS game which has more than 300 million faithful players in China. Now the battle is on, there are various modes and weapons for you to explore! Call your friends and join us,get into the battle field now!

Experience a visceral Campaign or assemble your team in the ultimate online playground with multiple Special Ops challenges and a mix of Multiplayer maps and modes.

Escape an astonishing disaster in Ring of Elysium, a battle royale shooter developed by Aurora Studio.

An action-packed FPS where you defend your trench against waves of attacking enemies by utilizing a large selection of modern (and not so modern) military weapons, features both single-player and two player online multiplayer (peer-to-peer).

The world is being attacked by hidden forces, Uncover the plot and unravel a plan to bring the world into chaos.

Dawn of Decay is a 3D low poly multiplayer zombie survival game where players team up to navigate immersive maps, fend off relentless zombie waves, and rely on strategic gameplay to survive.

Welcome to Call of Duty®: Warzone™, the massive free-to-play combat arena which now features Urzikstan, Rebirth Island and Fortune’s Keep.

Zero Caliber is the ultimate VR FPS: single player/Co-op campaign, PvP and mod support with 40+ realistic firearms & melee weapons, 100+ unlockable skins, 50+ attachments, realistic physics, progression & more! Immerse yourself in the action, customize your gear and unleash your inner hero!

Limbo Revolution is a first-person shooter set in a 1980s Eastern European City ravaged by war. In this haunting world, you play as a stalker, battling and surviving against bandits, other stalkers and the military.

Broken War is an intense first-person shooter that combines different multiplayer modes.

Blood Rot: 1918 has players fighting against hordes of the undead in the midst of The Great War. Survive solo, or with friends in this first-person zombie shooter.

Uploaded is a fast-paced, parkour, online multiplayer, and single-player shooter created by only one developer where you play as a robot with a human mind uploaded to it.

NOW AVAILABLE! When the Earth falls to an extra-terrestrial invasion, humanity becomes an endangered species. Earthfall is a four-player cooperative shooter that challenges players to survive hordes of ruthless alien drones and their inscrutable masters.

ShotFightDisaster (SFD) is a turn-based, tactical, multiplayer FPS shooter similar to Counter Strike. Use your extra equipment to give you and your team an advantage in battle.

Multiplayer action game in the entourage of the Second World War with total destruction of the environment. Complete freedom of action. Do anything and anywhere. Build defense, demolish enemy towns, control any vehicle which you will see on your way or create.

Plunge into the thrill of our dynamic shooter, intricately designed to match your gaming style and secure victories in every match. Engage in intense skirmishes where skill and strategy triumph. Each tailored experience promises a finely tuned journey, brimming with the joy of winning the Match.

Hello Space Survivors, this is little shooter game. Which is now most about shooting zombies but pvp will hopefully follow. Please also read the long description.

Online FPS game, near future background, Resource Warfare between Military Forces and PMC. More than 50 kinds of original weapons with customization option. Use Peripheral objects, Tactical drones, Active objects to experience dynamic warfare.