Way back in 2012, the Black Mesa mod for Half-Life had lofty plans to entirely rebuild the game in the Source engine.

If you'd been awaiting the release of much-anticipated the Xen levels, we have bad news—it's been delayed again, despite the mod moving from a free-to-play to Early Access model in order to take on new staff and strengthen the development team.

"We are truly sorry for getting everyone's hopes up and then delaying... again," said project lead Adam Engels via a recent statement. "We worked very hard to make December, but we are not yet ready. As a team, we take FULL responsibility for that. We have an internal deadline we are confident in, and we will be getting everyone more details as we get closer to that date.

"Thank you again to our community and Early Access supporters. The funding from Early Access has allowed us to hire many new talented developers, and has allowed older developers to put more time in the project. Simply put, Xen has proven to be an enormous undertaking, and while we are managing it to the best of our ability, it is proving to take longer than we estimated."

But while Xen release has been pushed back, there will nevertheless be an update next month. Focusing initially on improving stability and "enabling the new tech on the Earthbound section of the game", the final chapters will drop once everything's "fully stabilised". Tweaks include lens flare, texture blends, and improvements to the dynamic lighting—for the full breakdown, pop by the update on Steam.

You can pick up the Black Mesa mod now for $8, saving 60 percent off the full price. 

Half-Life 2 also continues to thrive, and Gunship Mark II's work-in-progress Half-Life 2: MMod is also gearing up for release.

Thanks, GameInformer.