Counter-Strike is one of the most important and influential PC games in history. It began as a Half-Life mod released in 1999 before Valve bought it out and hired the creators. The version of the game it released in 2000 would over time and tweaks become known as Counter-Strike 1.6, and to this day you will find purists who insist this is the best the game's ever been. Now, pretty remarkably, you can just play it in your browser... Read more.