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 Ultimate Doom's E4M3 played with Freedoom in Doom 0.12.1. The lights match with the colors of the projectiles being thrown by Freedoom's monsters. Played through Zandronum 3.0.1.