While we collectively wait for Half-Life 3 to happen, let's continue the story of Opposing Force.
Prospekt, the mod created to continue the story of Half-Life's Opposing Force, is now available on Steam. Created by Richard Seabrook, Prospekt was given the go-ahead from Valve recently.
In it, you play the story of US Marine Adrian Shephard after he was teleported into the Nova Prospekt prison by the Vortigaunt to help fight the Combine. The mod is standalone, and the developer reckons it's about as long as Half-Life 2: Episode One
You can buy it now from Steam for $9.99, £7.50, €9.99.
The trailer below should give you and idea of what to expect: