Half-Life has gained acclaim for its graphics, realistic gameplay, and seamless narrative. They built Half-Life using GoldSrc, a heavily modified version of the Quake engine licensed from id Software. Valve co-founder Gabe Newell said the team aims to create an immersive world, not a shooting gallery. Unlike many other games of the time, the player is in almost constant control of Freeman, and the story is told largely through a series of scenarios seen through his eyes. The main game consists of battles against aliens and human enemies using a variety of weapons and solving puzzles. Players take on the role of Gordon Freeman, a scientist who must find his way out of the Black Mesa Research Facility after an alien attack. It was Valve’s debut product and the first game in the Half-Life series. Half-Life is a First Person Shooter (FPS) game developed by Valve and published by Sierra Studios for Microsoft Windows in 1998.