A fan-made Half-Life 2 campaign that expands on the story in 1999's Half Life: Opposing Force will launch on Steam in February.
Prospekt, made by Richard Seabrook, is said to be as long as Half-Life 2: Episode One. It launches Feb. 11. The project began last year as a kind of job application to Valve, and when that didn't work out, was posted to Steam Greenlight in June, where it was quickly approved.
Half-Life: Opposing Force was a spinoff of the original entry in the Half-Life series, made by Gearbox Software and designed by Randy Pitchford. It was the only appearance for the main character, Adrian Shephard, who has had a kind of loose canonical/non-canonical status since. Prospekt will continue with Shephard in the lead role.
In Prospekt, Shephard is summoned by the Vortigaunts to aid Gordon Freeman, who is being overrun by soldiers inside the Nova Prospekt prison. Prospekt has 13 levels.
Seabrook, 25, promises a "substantial, highly polished and totally new addition to the Half-Life 2 universe." He has permission from Valve to use Half-Life content and assets.
Seabrook was the only deeloper behind this project. It will cost $10, and one doesn't need to own Half-Life 2 to play it.