Note that while it’s a mod, it is a standalone download and does not require the original game to be currently installed on your drive. System Requirements & Performance

—it will appear as a separate standalone entry.

Developed by NVIDIA’s Lightspeed Studios, this version utilizes to replace the game’s original rasterized graphics with full path tracing. Every light source now casts realistic shadows, and surfaces react to illumination with physically-based properties. Whether it’s the glow of a portal or the cold sheen of a Companion Cube, the Aperture Science Laboratories have never looked more immersive. How to Download for Free

If you already own in your Steam library, you can claim this upgrade right now: Search for " Portal with RTX " on the Steam Store .

Be warned: those "Next-Gen" visuals come at a cost. To experience this version, you’ll need a GPU capable of hardware-accelerated ray tracing. Portal With RTX - Gameplay Walkthrough (FULL GAME)