Final Doom: Plutonia Experiment - Go 2 It (Level 32)

Plutonia Experiment is one of the two campaigns of Final Doom and includes 30 regular levels and 2 secret levels. It was designed by the Casali brothers and released in June, 1996. The campaign is roughly split into three sections. You begin on Earth, then progress to the hell levels and finally end up in the devil hive. It&up to Doomguy to get to the site of the hell gate and close it before Earth is overrun.