Black Mesa: Source, the free high-def remake of Valve's first-person shooter classic Half-Life, is a clear example of how awesome the PC gaming/modding community is. For no reason other than they wanted to, the team behind Black Mesa painstakingly rebuilt Half-Life inside the Source engine, prettied up all the art, and released the result for free. On Tuesday - Half-Life’s fifteenth birthday - Black Mesa received permission from Valve to be sold on Steam.

“Last year, Black Mesa was one of the first Steam games to be Greenlit by you, our amazing fans,” project lead Carlos Montero wrote in a post on the community forums. “We've had quite a year since then, with a lot happening internally that we haven't been able to talk about... until now. Black Mesa has been given the opportunity to be sold as a retail product on Steam!"

The big surprise is Valve allowing Black Mesa to profit from what is, basically, a work of fan tribute. Although a groundswell of popular support put Black Mesa on the Steam store, there was never an expectation that the game would ever be anything other than free-to-play. "The use of Valve's for monetary gain was not predicated by our being greenlit," Montero tells PC Gamer. "This was really the only thing we thought to be possible at the time." It says a lot about the quality of Black Mesa that Valve is allowing them to profit from the Half-Life universe.

"This is an incredible honor—one we never expected—but also one we found hard to accept," Montero continued in his forum post. "We never developed Black Mesa with money in mind. Our team is made up of average, hardworking people, and no one joined the team to make money. For us, Black Mesa is purely a labor of love.”

While no price has been set, you'll soon be able to support the Black Mesa team for a “relatively low” price. The free version will still be available, however, and the team continues to plan frequent updates. High on that list is the release of Xen, the much-anticipated final chapter of the Half-Life remake, but unfortunately that update is "still a ways off."

Concept art source: ValveTime.net

Half-Life 3 remains in a state of existential limbo, just like it was around a week ago, before the long, long, long-awaited sequel cropped up on this European Union trademark site. As discovered by Valve Time, the trademark has now been removed, suggesting that it was most likely a hoax. Considering the proximity of the Portal 3 trademark listing, there's a good chance of that being a fake too. In better news, HomeLand season 3 starts on Channel 4 tonight, which...oh God, it's happening again.

Of course, that trademark listing was soon accompanied by a revealing peek through Valve's Jira database - which seemed to confirm that there are high-profile teams at Valve working on Half-Life 3 and Left 4 Dead 3 - and this probable hoax can't undermine that. What it does mean is that there's now nothing to suggest a Half-Life 3 (or indeed a Left 4 Dead 3) announcement is happening anytime soon, if indeed that's what a trademark listing even indicates in the first place. It's disappointing news, perhaps, but take heart from the Jira stuff - there are some very talented names knocking around there.

Thanks to Game Informer.