Top 12 games similar to Counter-Strike: Source

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   Counter-Strike

   Play the world's number 1 online action game. Engage in an incredibly realistic brand of terrorist warfare in this wildly popular team-based game. Ally with teammates to complete strategic missions. Take out enemy sites. Rescue hostages. Your role affects your team's success. Your team's success affects your role.

   Action
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   Day of Defeat: Source

   Valve's WWII Multiplayer Classic - Now available for Mac.

   Action
3. 3
   

   Garry's Mod

   Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.

   CasualIndieSimulation
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   Titanfall® 2

   Respawn Entertainment gives you the most advanced titan technology in its new, single player campaign & multiplayer experience. Combine & conquer with new titans & pilots, deadlier weapons, & customization and progression systems that help you and your titan flow as one unstoppable killing force.

   Action
5. 5
   

   Call of Duty®: Black Ops II

   Pushing the boundaries of what fans have come to expect from the record-setting entertainment franchise, Call of Duty®: Black Ops II propels players into a near future Cold War

   Action
6. 6
   

   Call of Duty® 4: Modern Warfare® (2007)

   The new action-thriller from the award-winning team at Infinity Ward, the creators of the Call of Duty® series, delivers the most intense and cinematic action experience ever. Call of Duty 4: Modern Warfare arms gamers with an arsenal of advanced and powerful modern day firepower and transports them to the most treacherous hotspots...

   Action
7. 7
   

   Insurgency

   Take to the streets for intense close quarters combat, where a team's survival depends upon securing crucial strongholds and destroying enemy supply in this multiplayer and cooperative Source Engine based experience.

   ActionIndieStrategy
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   Arma 2: Operation Arrowhead

   Three years after the conflict in Chernarus, portrayed in the original Arma 2, a new flashpoint explodes in the Green Sea Region. Coalition forces led by the US Army are deployed to Takistan to quickly restore peace and prevent further civilian casualties.

   ActionSimulationStrategy
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   Battlefield 3™

   Enjoy total freedom to fight the way you want. Explore 29 massive multiplayer maps and use loads of vehicles, weapons, and gadgets to help you turn up the heat. Every second of battle gets you closer to unlocking tons of extras and moving up in the Ranks. So get in the action.

   Action
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    Battlefield™ 6

    The ultimate all-out warfare experience. In a war of tanks, fighter jets, and massive combat arsenals, your squad is the deadliest weapon.

    Action
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    Apex Legends™

    Apex Legends is the award-winning, free-to-play Hero Shooter from Respawn Entertainment. Master an ever-growing roster of legendary characters with powerful abilities, and experience strategic squad play and innovative gameplay in the next evolution of Hero Shooter and Battle Royale.

    ActionAdventureFree To Play
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    Battlefield: Bad Company™ 2

    Battlefield: Bad Company 2™ brings the award-winning Battlefield gameplay to the forefront of PC gaming with best-in-class vehicular combat and unexpected "Battlefield moments." New vehicles like the ATV and a transport helicopter allow for all-new multiplayer tactics on the Battlefield. With the Frostbite-enabled Destruction 2.

    Action