Push Half-Life 3 to the back of your mind, where it surely spends most of its time these days. How about some new Half-Life 2? Indie dev Richard Seabrook has spent the past two years working on a continuation of Gearbox's Half-Life 1: Opposing Force story, and the result, Prospekt, is said to match Half-Life 2: Episode One in length. February 11 is the big day.

At one point in Prospekt's development, Seabrook loaded it onto memory sticks, packed them in a briefcase adorned with the lambda logo and dispatched it to Gaben. He did not hear back. After passing through Greenlight, however, Prospekt gained Valve's nod of approval for the licence and assets.

As Gordon Freeman is cornered in Nova Prospekt, the Vortigaunts teleport US Marine Adrian Shepherd into the fray to give him a fighting chance. That's you. In total, Prospekt has 13 levels (including a return to Half-Life 1's Xen, which the long-running Black Mesa project is still working on) and upgrades the visuals of the original setting.

Prospekt will cost £7.50/$10. You don't need to own Half-Life 2 to play, but I'm saying that you should own Half-Life 2, you strange maverick.