MAP30: The Gateway to Hell is the thirtieth and final map of The Plutonia Experiment. It uses the music track "The End of DOOM", the music from Doom's text screens. The Gateway to Hell is one of the three official Doom IWAD levels where the Icon of Sin appears, in this case also protected by a Cyberdemon. This is one of the three levels of Plutonia that contains the same number of monsters and objects regardless of the selected skill level, with the exception of an extra multiplayer-only cube shooter on UV and NM skill levels. A separate Deathmatch area also exists outside the main map.