From a Half-Life Mod to Pet Chickens: Counter-Strike's 27-Year Run
Counter-Strike began as a student's side project on top of Valve's first game. It's now a free-to-play giant that still gets patched most weeks. How a mod became Valve's longest-running game, and what its latest update says about where it's going.
Some of the most important games in PC history were made by people who didn't work at a games company. Counter-Strike is the classic example. It was a mod, built on top of someone else's game, by a modder with no studio behind him. Twenty-seven years later, it's still among the most-played games on Steam.
The first beta of Counter-Strike was released on June 19, 1999, as a free modification for Valve's Half-Life. Its creator was Minh "Gooseman" Le, soon joined by Jess Cliffe, who worked on maps and more. Today it lives on as Counter-Strike 2, a free-to-play game on Steam that Valve was still updating as recently as November 5, 2026.
A mod that Valve bought
Half-Life shipped in November 1998 with tools, and its engine was already a heavily reworked version of id Software's Quake technology. Modders loved it. Counter-Strike took Half-Life's engine and threw away the science-fiction story: two teams, terrorists and counter-terrorists, buying weapons between rounds and fighting over bomb sites and hostages. Die and you sit out the rest of the round.
The idea spread through LAN parties and early online servers. Valve noticed. Around the mod's fifth beta, Valve bought the Counter-Strike IP and hired Le and Cliffe, before the game's first retail release in 2000. On Steam, the original Counter-Strike still has its own store page today.
Three engines, one game
What's remarkable about Counter-Strike is how little its core has changed. The mod became Counter-Strike 1.6, then Counter-Strike: Source, then Counter-Strike: Global Offensive in 2012, and finally Counter-Strike 2 in 2023. Graphics, netcode and the economy have all evolved, but a round in 2026 is still recognisably a round from 1999: buy, plan, execute, and hope your AWPer doesn't whiff.
CS:GO also changed the business. It was one of the first Valve games with a curated Steam Workshop for items, where community artists submit skins and get paid when Valve adds them. By January 2015, Valve said Workshop creators had earned more than $57 million since 2011, across Counter-Strike, Team Fortress 2 and Dota 2. Skins turned a shooter into an economy.
What the November update changed
Valve's November 5, 2026 update is a good snapshot of where CS2 is now. It's small, nerdy and full of quality-of-life tweaks:
- Retakes: bombs now defuse instantly when there's enough time and no utility could stop it, with shorter freeze time and faster round restarts.
- Pet chickens: ping one during freeze time and it performs a trick. Their names hide if you've hidden custom item text.
- Map scripting: a reorganised Entities API for map makers, with new ways to spawn entities, detect bot control and reset player pawns. Old method names still work but are deprecated.
That last item is the one to watch. CS2's scripting tools let community mappers build game modes inside the game, the same spirit that created Counter-Strike in the first place.
The Korean connection
Counter-Strike arrived in Korea in the same era as StarCraft and the first PC bang boom. In 2026, Korean PC bang charts are led by League of Legends and Valorant, Riot's own answer to Counter-Strike. CS2 still had week-on-week gains in PC bangs this October, but the tactical-shooter crown in Korea belongs to Valorant (our Valorant Hush story).
Why it matters
Counter-Strike is proof that PC gaming's openness pays off. A modder used tools Valve shipped with Half-Life, and Valve was smart enough to buy rather than bury the result. The game has outlived three engines and countless rivals, and its newest update is still, at heart, about giving creators better tools. For the story of the game it started from, read our Half-Life history; for the wider modding scene, see our modding culture feature.