Doom 64 Retribution project is a full re-make and "port" of Doom 64 for the Nintendo 64 to the GZDoom engine. The goal of the project is be mostly accurate to the original game as well as add very minor improvements for that extra bit of polish. Think of this mod as being a remastered or enhanced version of Doom 64 for GZDoom. We have Doom 64 EX, Doom 64 Absolution TC, GZDoom64, and Brutal Doom 64. Why you ask? Nevander, the creator of this mod was personally dissatisfied with the quality of the GZDoom64 project, and Brutal Doom 64 (while it is a great improvement) is along the same lines but changes too much and deviates from the original Doom 64 experience. And thus, this project was born. The current version 1.5 can be found at the development thread over at Doomworld.