A mod that uses Freedoom graphics, sounds, and sprites so they can be played in the official Doom IWADs. The mod is playable on a variety of supported source ports, including GZDoom, Zandronum, Chocolate Doom and derivatives, Doom Retro, and more!
The Plutonia Experiment's MAP32 played with Freedoom in Doom 0.12.1. Maybe you shouldn't Go 2 It? Played through PrBoom+ 2.5.1.7.