For a game similar to 'Counter-Strike Online' ...

Video Game genre...

Action adventure RPG Shooter Racing Platform Strategy Fighting Simulation puzzle MMORPG Music Arcade Fantasy Eroge Sports game Visual novel Survival horror Third-person shooter First-person shooter

On following platform...

Microsoft Windows Sony PlayStation 2 Xbox 360 Sony PlayStation 3 Sony PlayStation iOS Nintendo Wii Nintendo DS Mac OS X Amiga Super NES PlayStation Portable Xbox GBA Nintendo Entertainment System Sego MegaDrive Android GameCube GNU/Linux Game Boy Saturn PlayStation Vita Nintendo 3DS Nintendo 64 Sega Dreamcast Game Boy Color Sony PlayStation 4 Wii U Sega Master System Sega Game Gear

... I can play

VBS1

VBS1

2002  ShooterSimulationFirst-person shooter - Microsoft Windows - multiplayer  Single player  
 Get game VBS1
VBS1 - Wikipedia VBS1 (Virtual Battlespace Systems 1) is a military simulator which relies heavily on modern game technology and is therefore generally referred to as a serious game. The platform is derived from the first-person entertainment game Operation Flashpoin ...   more on Wikipedia
SiN

SiN

1998  First-person shooter - GNU/Linux Microsoft Windows - multiplayer  Single player  
 Get game SiN
SiN - Wikipedia SiN is a first-person shooter video game based on a modified version of the Quake II engine developed by Ritual Entertainment and published by Activision in late 1998. The game was later released over Steam platform on April 5, 2006, either as a stan ...   more on Wikipedia
Far Cry 2

Far Cry 2

2008  First-person shooter - Xbox 360 Microsoft Windows Sony PlayStation 3 - multiplayer  
Far Cry 2 Uplay Key GLOBAL is a game released on 2008-10-22. Published by Ubisoft.
 Get game Far Cry 2
Far Cry 2 - Wikipedia Far Cry 2 is an open world first-person shooter developed by Ubisoft Montreal and published by Ubisoft. It was released on October 21, 2008 in North America, October 23, 2008 in Australia and October 24, 2008 in Europe. It was made available on Steam ...   more on Wikipedia
Sanctum 2

Sanctum 2

2013  First-person shooter - GNU/Linux Mac OS X Xbox 360 Microsoft Windows Sony PlayStation 3
Sanctum 2 is a unique hybrid between FPS and Tower Defense developed by Coffee Stain. Master four different classes, each with a unique skillset as you make your way through the campaign or play with others in a up to 4 player co-op mode! Build defense towers when it is time for that, then switch to blasting your opponents in fast-action FPS.
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Sanctum 2 - Wikipedia Sanctum 2 is a first-person shooter tower defense video game, developed by independent developer Coffee Stain Studios for Microsoft Windows, OS X, Linux, PlayStation 3 and Xbox 360. The successor to Sanctum, Sanctum 2 was announced in 2012 and releas ...   more on Wikipedia
.kkrieger

.kkrieger

2004  First-person shooter - Microsoft Windows - Single player  
 Get game .kkrieger
.kkrieger - Wikipedia .kkrieger (from Krieger, German for warrior) is a first-person shooter video game created by German demogroup .theprodukkt (a former subdivision of Farbrausch) which won first place in the 96k game competition at Breakpoint in April 2004. The game re ...   more on Wikipedia