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.

Counter-Strike: Global Offensive is a popular first-person shooter video game released in 2012. It is the fourth installment of the Counter-Strike franchise and builds upon its predecessor by introducing new maps, characters, weapons, and updated versions of classic CS content. The game has become one of the most popular online shooters with millions of players around the world competing in different game modes such as competitive ranked matches or casual ‘deathmatch’ style games. Players can choose from a variety of weapons to customize their loadouts for each match and use tactics to outsmart their opponents in order to win rounds.

Battlefield 3 is a popular first-person shooter video game that immerses players in the chaos of modern warfare. Players take on the role of elite U.S Marines and engage in intense single player missions and multiplayer battles across various locations around the world, including Europe, Middle-East, and North America. The battlefield comes alive with realistic sound effects like bullets whizzing by and explosions that throw you to the ground for a truly immersive experience.

Call of Duty: Black Ops, developed by Treyarch, is the next installment in the Call of Duty franchise. It is rumored to be a first-person shooter set during the Cold War period. The game will feature an extensive single player campaign and competitive multiplayer modes as part of its core gameplay experience. This will be the second time in the series that it has gone back to a period prior to World War II, with 2008's Call Of Duty: World At War being set during WW2. With Black Ops, players can expect new weapons and technology from this era along with classic elements from previous entries in the series such as zombies mode and online play for up to 16 people simultaneously.

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.

Battlefield 4 is an action-packed video game with unrivaled destruction. Powered by Frostbite 3, players have the ability to demolish buildings and lead assaults from a gun boat. The game offers freedom of choice in order to play to strengths and achieve victory. It features a dramatic character-driven campaign that follows your squad's journey home, as well as interactive environments that react to player actions. Players can dominate land, air, and sea through water-based vehicular combat for an immersive experience.

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.

Call of Duty: Black Ops II is a first-person shooter video game set in a near-future version of the Cold War. Players take on the role of an elite soldier tasked with thwarting Raul Menendez, a diabolical villain who has hijacked US military infrastructure to advance his own agenda and bring the world to the brink of destruction. The game features state-of-the-art technology and next-gen robotics, allowing players to use advanced weapons and equipment in order to save humanity from total annihilation.

Call of Duty: Modern Warfare 3 is a first-person shooter video game and the direct sequel to the previous installment in the series, Call of Duty: Modern Warfare 2. In its single-player campaign, players continue their struggle against an invasion by Russian Federation forces following a terrorist attack on Moscow that was framed on an undercover U.S. agent. Players can experience classic multi-character control as well as deep multiplayer support with two-player co-op Survival mode, new Kill Streak categories, and customizable strike packages for more player combat options and strategies.

Call of Duty: Advanced Warfare is a video game set in the future, where powerful battlegrounds are shaped by technology and tactics. Kevin Spacey plays Jonathan Irons, founder and president of the Atlas Corporation which is one of the world’s largest Private Military Corporations (PMCs). Exoskeletons allow for enhanced movement and verticality with abilities such as boost jumps, grappling and cloaking. Armor and weaponry have also been upgraded to provide players with tactical freedom in any terrain. Players must use all these advanced tools at their disposal to battle against forces that threaten world peace.

Call of Duty: Ghosts is a first-person shooter video game that takes place in a world where global power has been permanently redrawn. Players take on the role of members of a surreptitious group known as Ghosts and fight against an emerging, technologically superior global power. The game features over 20 new kill streaks such as Juggernaut Maniac, Helo-Scout, Vulture and the ODIN Strike. Additionally there is also the option to bring in Riley from the single-player campaign as your guard dog to warn you of enemies and attack them if they get too close.