Half-Life is a critically acclaimed first-person shooter video game developed by Sierra and released in 1998. It has won more than 50 Game of the Year awards from publications around the world, and was named 'Best PC Game Ever' in PC Gamer's November 1999 issue. Half-Life combines great storytelling with intense action and advanced technology to create an immersive experience for players. Set in a frighteningly realistic world, Half-Life requires players to think strategically if they want to survive its challenges and ultimately achieve success.

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.

Gunman Chronicles is a first-person shooter video game that was developed by a group of amateur designers. Despite its unique origin story, there are many other first-person shooters out there that offer more rewarding experiences for players. As such, it may be worth considering trying out one of those games instead if you're looking for an exciting gaming 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.

Day of Defeat is the latest online action experience from Valve, makers of Half-Life and Counter Strike. Set in WWII's European theater of war, players join an elite military squad to battle as a unit for victory. There are 10 new multiplayer maps with 15 total available for play, featuring authentic weaponry and various modes. New features include character models/animations, increased textures, particle effects and even a British soldier class option. Players can take on the role of snipers, infantry, machine gunner or rifleman to achieve success in this immersive first person shooter game.

Half-Life: Blue Shift is the second expansion pack for the groundbreaking first-person shooter Half-Life. Players take on the role of security guard Barney Calhoun, and must fight to rid Black Mesa compound of any extraterrestrial or misguided soldiers that stand in their way. The game also includes Opposing Force, which was the original expansion pack for Half-Life.