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

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.
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