«Visions of Eternity is an episode for the Ultimate Doom in spirit of the original Doom episodes. It starts off as an episode 1 themed episode, but later the style moves more towards an episode 2 and 3 style. Special attention was put into enemy balance and (in the newer maps) open levels that allow for multiple ways through the map.
In addition to the episode itself, there is a PDF booklet inside the zip which contains the “story”, background information and trivia about the development of the episode. Caution: The booklet contains the map layouts and thus spoilers.» — Tobias Münch
Footnote: there are few odd instances that would require you to use the mouselook, yet nothing particularly crucial to halt your actual progression; the WAD is perfectly beatable without it.
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