Valve's Half-Life 2 is still a wonderful milestone of PC gaming more than 20 years after its original release, but it recently got its dated visuals pumped up with a mod that lets you flex the power of a cutting-edge graphics card. In a video sponsored by Nvidia, PCWorld's Adam goes through the new ray tracing and graphical enhancements and talks with the developers who implemented them. Half-Life 2 RTX is a free upgrade if you already own the original (and after a million Steam sales, who doesn't?), though you won't get all the enhanced goodies unless you're lucky enough to have an RTX 50-series card. We're talking ray tracing and path tracing for incredible lighting, plus new in-game assets with more polygons and better textures so you have something nice for those rays to bounce off. Naturally, this is going to make your gaming PC sweat a little more than the unmodified 20-year-old game.