Mission 13: Devil's Dalliance | Secret Doors DMC: Devil May Cry Guide

DOOR 1/2 (required Ivory Key; bonus mission Shenanigans) - Door can be found after ending first battle in the club, before moving on. Look for platforms on right from the Divinity Statue and get onto a balcony using Angel Boost and Angel Lift.

DOOR 2/2 (required Argent Key; bonus mission Hasty Acquisition) - Door can be found on your way to the sixth round, on the lower level of the biggest platform (the one with Divinity Stature).