The Plutonia Experiment is an IWAD released on June 17, 1996, which forms one half of Final Doom (the other half being TNT: Evilution)
Compared to TNT: Evilution, The Plutonia Experiment is considered much more difficult due to the influx of strong opposition in the earlier levels, massive amounts of said enemies in the later stages, especially on the Ultra-Violence difficulty, and level designs and effects that were against the regular norm (such as usage of invisible bridges). According to sources, the Casali brothers intended to make The Plutonia Experiment harder than the usual Doom fare in order to challenge already battle-hardened players.
