DooM 64 is the real DooM 3.
Though it wasn't the first of its kind, the original DooM is often credited as the game that popularized the first-person shooter. With detailed graphics for the time, heaps of ugly baddies, a handful of cool weapons, and endlessly challenging gameplay, it's no wonder it was a hit. Despite a slower gameplay pace than the previous PC games, DooM 64 is a worthy followup and an enjoyable run 'n gun shooter in its own right. For better or worse, they don't make 'em like this anymore.