And it's available to pre-purchase on Steam right now. And, it comes with Valve's blessing. Which, when you try and picture how that came about, is downright impossible without a robed figure, a smokey religious trinket of some sort, a sacrifice, and old timey chanting. 'Prospekt' for those not in the know, continues the story of soldier boy Adrian Shephard, who starred in the first Hal-Life expansion 'Opposing Force'. Although that came out in 1999, Prospekt is a stand-alone release and has been built utilising the more familiar Half-Life 2 assets.

Out next month, the title can be pre-purchased now for $8.99 USD, and for that price you get a brand new Half-Life experience "comparable to Half-Life 2: Episode One in length". Check out the trailer below, which is especially impressive when you factor in that this was developed by a single person, Richard Seabrook.