This is a guide for The Hot And Winding Road achievement. (Find the secret exit in Quake Episode 3: The Netherworld.)
Level: E3M4: Satan’s Dark Delight
Step 1
Go to the moving platform on the right to activate the one on the left.
Step 2
This activates the platform on the left from the first screenshot.
Step 3
Look to the left at the bottom of the stairs
Step 4
Jump into the pit and you are done!Thanks to nokturnal for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.
