What is Ultimate Doom the Way id Did for in Master Levels Reject

[IDDQD1337]

Can you explain what Ultimate Doom is like it was done in Master Levels? It's not part of Master Levels and it only came out in 2019.

[Owlet7]

John Anderson's Inferno series was originally supposed to consist of 9 maps. 2 of those were released as freeware (dantes.wad and acheron.wad), while the next 5 maps were included in Master Levels for DOOM II. The 8th map was repurposed into E4M7 from The Ultimate DOOM. The final 9th map was never finished.

Ultimate Doom the Way id Did is a megawad in the style of the Thy Flesh Consumed episode. The final map is done in the style of and is dedicated to John Anderson, and is based on the only known screenshot of the unreleased 9th canto of Inferno.

WadFusion only extracts this one map from UDTWiD, to give the Inferno series a proper conclusion.