COUNTER-STRIKE: GLOBAL OFFENSIVE"Counter-Strike: Global Offensive is an online first-person shooter developed by Hidden Path Entertainment and Valve Corporation. It is the fourth game in the main Counter-Strike franchise"
CALL OF DUTY 4"Call of Duty 4: Modern Warfare is a 2007 first-person shooter video game, developed by Infinity Ward and published by Activision for Microsoft Windows."
COUNTER-STRIKE: SOURCE"Counter-Strike: Source is a complete remake of Counter-Strike using the Source Game Engine. As in the original, Counter-Strike: Source pits a team of counter-terrorists against a team"
COUNTER-STRIKE 1.6"Counter-Strike is a first-person shooter game in which players join either the terrorist team, the counter-terrorist team, or become spectators. "
COUNTER-STRIKE: CONDITION ZERO"With its extensive Tour of Duty campaign, a near-limitless number of skirmish modes, updates and new content for Counter-Strike's award-winning multiplayer game play, plus over 12 bonus single player missions, Counter-Strike: Condition Zero is a tremendous offering of single and multiplayer"