Half-Life is a series of first-person shooter games developed and published by Valve, beginning with the original Half-Life, released for Windows in 1998. The earliest known canceled Half-Life project dates to 1999. Between Half-Life 2: Episode Two (2007) and Half-Life: Alyx (2020), at least five games were canceled, including Half-Life 2: Episode Three and a version of Half-Life 3. Games developed by other studios have been canceled, including games by 2015, Inc., Junction Point Studios, and Arkane Studios.