The Saturn Port of Quake featured 4 exclusive secret levels not present in any other version. Each level could be accessed via a secret exit, one in each of Quake's 4 episodes. This video has complete playthroughs of all 4 Levels.
I am using a Saturn Wireless Control Pad from Retro-bit, and playing via Mednafen. This footage is provided without Commentary.
Quake for the Saturn was Developed/Ported by Lobotomy Software and Published by Sega.
If you want to skip to the levels, here are the timestamps for each level
Cpt FishStick presently has 5,068 views for Quake across 3 videos, and close to 2 hours worth of content for Quake published on his channel. This is 9.21% of the total watchable video on Cpt FishStick's YouTube channel.