In the spirit of "why the hell not", a group of five modders is recreating Half-Life 2 in the Half-Life engine. There may be practical reasons for using this mod – maybe you don't own a copy of Half-Life 2 but you do own a copy of Half-Life – but these demakes are usually done just to see if they're possible.
So far, so good: the team has already completed the game's first chapter, but they need help – especially from programmers and modelers. The mod's demo is currently available on ModDB, where you can also follow its progress.
"You might be aware that this has already been attempted already, but none of these have actually panned out," the description reads. "With Half-Life 2 Classic, we hope to communicate more with the community, so that even if we don't manage to recreate the whole game, we can still release a substantial part of it, which can be continued by someone else in the future."
Meanwhile, whether the mod will be a deliberately retro-styled outing, or whether they'll try to match Half-Life 2's fidelity, is yet to be seen. "We're still debating if we should stick close to Half-Life 2's graphics, or if we should downgrade them on purpose, and if so, how much. We may even make optional high-res models for the hd model pack, while keeping the base game's models low-res. But it depends on what most people want."
Check out the mod in action below. Cheers, Kotaku.