Portal RTX was unveiled yesterday at Nvidia's GTC presentation, a mod for the PC game that adds ray tracing to the game.

To do that, the mod will use RTX Remix, a new technique that makes it relatively easy to enrich old games with ray tracing and improved textures.

The mod will be released for free to owners of the PC version of the puzzle game in November. Nvidia has also created new assets for the game, which should make it look even better.