Counter-Strike (also known has Half-Life: Counter-Strike) is a first-person shooter video game developed by Valve Corporation. It was initially developed and released as a Half-Life modification by Minh "Gooseman" Le and Jess "Cliffe" Cliffe in 1999, before Le and Cliffe were hired and the game's intellectual property acquired. Counter-Strike was first released by Valve on the Microsoft Windows platform in 2000. The game later spawned a franchise, and is the first installment in the Counter-Strike series. Several remakes and Ports of Counter-Strike have been released on the Xbox console, as well as OS X and Linux. It is sometimes referred to as Counter-Strike 1.6 to distinguish it from other titles of the series, 1.6 being the final software update the game received.