Nvidia's RTX Remix is a tool that allows game modders to enhance classic PC games with path-traced visuals. One notable project is the transformation of the 2004 game Painkiller into Painkiller RTX, currently at version 0.1.6. This project utilizes a custom rendering technology called PainEngine, replacing the original Direct X 8.1 rendering with a path tracer, resulting in improved visuals such as real-time shadows and moving lights. The gameplay retains its fast-paced action focus, with enhanced mechanics through Havok physics, allowing for dynamic interactions with the environment. Painkiller RTX features significant upgrades in lighting, including dynamic lighting that interacts with moving objects and improved texture quality using Quixel megascan assets. However, the path-tracing technology requires robust hardware for optimal performance, and even mid-range GPUs like the RTX 4060 may struggle with frame rates during intense gameplay.