Valve Games By Konertag Nov 19, 1998 Half-Life Apr 7, 1999 Team Fortress Classic Nov 1, 1999 Half-Life: Opposing Force Nov 1, 2000 Ricochet Nov 8, 2000 Counter-Strike Jun 12, 2001 Half-Life: Blue Shift Nov 14, 2001 Half-Life: Decay May 1, 2003 Day of Defeat Mar 20, 2004 Counter-Strike: Condition Zero Oct 7, 2004 Counter-Strike: Source Nov 16, 2004 Half-Life 2 Dec 1, 2004 Half-Life 2: Deathmatch Sep 26, 2005 Day of Defeat: Source Oct 27, 2005 Half-Life 2: Lost Coast Jun 1, 2006 Half-Life 2: Episode One Oct 10, 2007 Half-Life 2: Episode Two Oct 10, 2007 Team Fortress 2 Oct 10, 2007 Portal Nov 18, 2008 Left 4 Dead Nov 17, 2009 Left 4 Dead 2 Jul 19, 2010 Alien Swarm Apr 19, 2011 Portal 2 Aug 21, 2012 Counter-Strike: Global Offensive Jul 9, 2013 Dota 2