Counter-Strike is a popular video game that modifies the multiplayer aspects of Half-Life, making it more team-oriented and providing players with an experience similar to what a real counter-terrorist or terrorist unit would go through. Players join either the Counter Terrorist team or the Terrorist team as they battle against each other in various mission scenarios. The goal of each round is to eliminate all opposing forces or complete objectives while also managing resources such as ammunition, money and health. With its fast pace and intense gameplay, Counter Strike has become one of the most popular online games today.

Quake III Arena is a fast-paced and intense online multiplayer game that will take players on an exciting journey through cyberspace. Players must be prepared to leave behind their common sense and doubts as they battle against legions of enemies in eerie, dangerous lands. The game tests players' reflexes and gut reactions as they face unpredictable hazards throughout the game. Players must immerse themselves in this thrilling experience if they want to survive.

Counter-Strike: Source is a popular video game from Valve that uses the Source engine. It has recreated maps from Counter-Strike 1.6, such as Office, Havana, Italy, Aztec, Chateau and more with new textures and improved buildings and scenery. Objects in these levels react realistically to the physics engine of the Source engine. The game can be downloaded through Valve's Steam service with Half-Life 2 included in the package.

In Return to Castle Wolfenstein, players take on the role of B.J. Blazkowicz, a highly decorated Army Ranger recruited into the Office of Secret Actions who must escape from and then return to Castle Wolfenstein in order to thwart Heinrich Himmler's plans for an unstoppable army raised through genetic engineering and harnessing occult powers. As Blazkowicz discovers more about Himmler's evil schemes, it is up to him to defeat them before they can level the Allies once and for all.

Counter-Strike: Condition Zero (CS:CZ) is a tactical action video game that requires players to compete with and against AI opponents in mission-based campaigns located around the world. As leader of an elite counter-terrorist unit, players must complete over 20 new missions which include rescuing hostages, escorting VIPs to safety, and locating and defusing bombs. This game uses advanced technologies such as detailed models, atmospheric enhancements like snow or rain, and other dynamic special effects powered by an enriched Half-Life engine. CS:CZ advances the award-winning Counter Strike series by introducing single-player action and online play enhancements for more strategic gameplay.

Killing Floor is a co-op survival horror game where up to 6 players can join an online mode or play solo. The objective of the game is for players, either alone or with friends, to cleanse each area of zombies in waves until they reach the last one - known as 'The Patriarch.' These enemies are actually specimens from a government program who have escaped and gone rogue. Players must use weapons such as chainsaws and rocket launchers to fend them off while also trying not to breach the Official Secrets Act 1911, 1920, 1989 by revealing too much information about their mission. In Killing Floor you will face hordes of zombies but ultimately it's your job to make them all go away!

Vietcong: Fist Alpha is an expansion pack to the original Vietcong game. The expansion introduces new characters, weapons and aircraft alongside single-player and multi-player missions. The player takes on the role of a US Special Forces team in Vietnam who must face off against the deadly Vietgong enemy. Joining First Alpha are Warren Douglas SFC and Ngueyn Nham as well as five members from the original Special Forces unit. To play this game, you will need to have the original Vietcong game installed.

Enemy Territory: Quake Wars is an epic online strategic shooter that pits the armies of Earth against invading aliens, the Strogg. Players can choose to battle as one of five unique classes in either the EDF or Strogg armies, each outfitted with specialist weapons and combat hardware. Both sides have access to over 40 conventional and futuristic vehicles as well as deployable structures such as quad-bikes, tanks and alien walkers for ground assaults; or helicopters and anti-gravity ships to lend firepower from the air. Teams establish bases, deploy defense systems into enemy territory while constructing obstacles to gain a tactical advantage over their opponents. Through multi-battle campaigns players strive not only for victory but also gain valuable skills and special rewards for team play along with persistent military promotions and medals.