Counter-Strike Games History Every Version From 1999 to CS2

Last updated: July 29, 2026

The Counter-Strike evolution from a two-person Half-Life mod in 1999 to one of the most played competitive games in history spans seven major versions, three engines, and over two decades. The core never changed – two teams, round-based economy, bomb defusal or hostage rescue. Everything around it did. Here is every version of Counter-Strike, what it was, when it came out, and what it actually changed. Download CS 1.6 from our portal to play the original version.

Counter-Strike mod – June 19, 1999

The Counter-Strike history starts on June 19, 1999. Minh “Gooseman” Le and Jess “Cliffe” Cliffe released the first beta as a free Half-Life modification. No purchase needed beyond Half-Life itself – the mod was free. It introduced the round structure, economy, bomb defusal, and hostage rescue that every Counter-Strike version since has kept unchanged.

Seven beta revisions followed through 1999 and 2000. Each added maps, adjusted weapon balance, and refined mechanics. By the time Valve bought the rights in April 2000 and hired both creators, Counter-Strike was already the most played online game on the planet by total hours – achieved with no marketing, no publisher, and no budget.

Beta	Date	Notable addition
Beta 1	June 19, 1999	First public release – bomb defusal, 2 maps
Beta 4	1999	de_nuke added by Jo Bieg
Beta 5.2	1999	de_dust added by Dave Johnston
Beta 6.5	2000	de_aztec, cs_italy, as_oilrig added
Beta 7	August 2000	Final beta before retail – de_train added

Counter-Strike 1.0 – November 2000

The first official standalone Counter-Strike release shipped November 9, 2000 – both as a retail box and as a free download via WON (Valve’s pre-Steam authentication platform). Mechanically close to Beta 7, but packaged as a finished product and sold commercially. This version established the weapon set, economy system, and map pool that all later Counter-Strike games built on.

The Counter-Strike competitive scene started forming almost immediately. CPL (Cyberathlete Professional League), WCG (World Cyber Games), and ESWC all held major cs tournaments before 1.6 even existed – on versions 1.3 and 1.5.

Updates 1.1 through 1.5

Between the 2000 retail release and Counter-Strike 1.6 in 2003, Valve released four major updates. Version 1.1 in March 2001 was the most significant in the entire Counter-Strike evolution – it added de_dust2, de_inferno, de_cbble, de_piranesi, de_chateau, de_vegas, and several others in a single update. The map pool went from the beta-era selection to something close to the final cs 1.6 map list that players know today.

Version	Date	Key change
1.1	March 2001	de_dust2 added, major weapon rebalance, most of the final map pool added
1.3	2002	Flashbang changes, hitbox adjustments, silencer fix
1.4	2002	de_cpl_mill added (CPL tournament map)
1.5	2003	Final WON version – last update before Steam launch

Counter-Strike 1.6 – September 9, 2003

Counter-Strike 1.6 launched September 9, 2003 alongside Steam – Valve’s digital distribution platform that replaced WON. The game itself was a refinement of 1.5 rather than a mechanical overhaul. It became the definitive Counter-Strike version because Steam made it the standard release going forward – if you bought cs 1.6 on Steam, this was it, and no further major versions followed for the original game.

The cs 1.6 competitive era ran for nearly a decade. CPL World Tour, ESWC, IEM, World Cyber Games – all used Counter-Strike 1.6 as the tournament standard. The game peaked as the dominant competitive title globally. The Non-Steam community also ran parallel servers throughout this period and continues today. For the mechanical differences between the GoldSrc engine and modern Counter-Strike, see our CS 1.6 GoldSrc mechanics guide.

CS 1.6 key facts
Release date	September 9, 2003
Engine	GoldSrc (modified Quake engine)
Launch platform	Steam (replaced WON)
Major tournaments	CPL, WCG, ESWC, IEM – all ran on 1.6 through ~2013
Map pool	Frozen at Steam launch – no maps added or removed since
Non-Steam	Active community on separate server infrastructure

Counter-Strike: Condition Zero – March 2004

Counter-Strike: Condition Zero was intended as a major overhaul with a single-player campaign, updated graphics, and bot AI. Development passed through Ritual Entertainment and Turtle Rock Studios before Valve completed it internally. What shipped was a game with bots and a mission campaign layered onto 1.6-era multiplayer without advancing the competitive Counter-Strike scene. The community treated it as a footnote. Turtle Rock’s bot AI work was later used in Left 4 Dead.

Condition Zero facts
Release date	March 2004
Engine	GoldSrc
Developers	Ritual Entertainment, Turtle Rock Studios, Valve
Added	Bot AI, single-player missions, exclusive maps
Competitive impact	None – 1.6 remained the competitive standard

Counter-Strike: Source – November 2004

Counter-Strike: Source rebuilt the game from scratch on the Source engine – the same engine as Half-Life 2. Updated graphics, physics objects that reacted to bullets and grenades, completely reworked netcode. The Counter-Strike community split: players who preferred 1.6’s movement feel and weapon physics stayed on 1.6, players who preferred updated visuals moved to Source. Both games ran competitive scenes simultaneously for years – 1.6 dominant in Eastern Europe and Asia, Source larger in North America and Western Europe.

	Counter-Strike: Source	Counter-Strike 1.6
Engine	Source	GoldSrc
Physics	Interactive physics objects	No interactive physics
Movement	Different bhop mechanics	Classic GoldSrc movement
Graphics	HL2-era visuals	Original GoldSrc
Competitive region	North America, Western Europe	Eastern Europe, Asia

Counter-Strike: Global Offensive – August 21, 2012

CS:GO launched August 21, 2012 developed jointly by Valve and Hidden Path Entertainment. Initial reception from the competitive community was poor – mechanics felt slower and less precise than 1.6 or Source. Updates through 2012-2013 addressed these complaints and both the 1.6 and Source communities gradually migrated.

The weapon skin system introduced in August 2013 transformed the game’s economics. Skins drove revenue, revenue funded the Major Championship prize pools, Majors attracted viewers, viewers drove more skin sales. The first CS:GO Major in August 2013 had a $250,000 prize pool. By the game’s final years the peak concurrent player count was 1.8 million, with over 1 million daily average players. CS:GO is the version of Counter-Strike that turned the series into the most watched esport of its era.

CS:GO key facts
Release date	August 21, 2012
Engine	Source
Skin system added	August 2013
First Major prize pool	$250,000 (EMS One Katowice, 2013)
Peak concurrent players	1.8 million
Replaced by	Counter-Strike 2 (September 2023)

Counter-Strike 2 – September 27, 2023

Counter-Strike 2 replaced CS:GO on September 27, 2023. CS:GO was removed from Steam the same day rather than continuing alongside it. The first complete engine change for mainline Counter-Strike since Source in 2004 – CS2 runs on Source 2. Smoke grenades now interact dynamically with the environment: bullets and explosions dissipate them, fire expands them. Sub-tick servers replaced the old tick-rate system. Skin inventories, rankings, and statistics carried over from CS:GO. Peak on launch day was 1.24 million concurrent players. The CS:GO Major Championship format continues unchanged.

Counter-Strike 2 key facts
Release date	September 27, 2023
Engine	Source 2
Key mechanic change	Dynamic smoke grenades, sub-tick servers
CS:GO status	Removed from Steam at CS2 launch
Launch day peak players	1.24 million concurrent
Inventory carry-over	All CS:GO skins transferred

Full Counter-Strike versions timeline

Version	Release date	Engine	Key change
CS Beta 1	June 19, 1999	GoldSrc (HL mod)	First public release
CS 1.0	November 9, 2000	GoldSrc	First retail release via WON
CS 1.1	March 2001	GoldSrc	de_dust2 and most final maps added
CS 1.6	September 9, 2003	GoldSrc	Steam launch – definitive original version
Condition Zero	March 2004	GoldSrc	Single-player campaign, bot AI
CS: Source	November 2004	Source	Full engine rebuild, physics, updated graphics
CS:GO	August 21, 2012	Source	Unified scene, weapon skins, Major Championships
Counter-Strike 2	September 27, 2023	Source 2	Dynamic smokes, sub-tick, replaced CS:GO

For how the original Counter-Strike 1.6 mechanics compare to modern CS, see our comparison of Non-Steam and Steam CS 1.6 versions. To play the original, download Counter-Strike 1.6 from our portal.