E3M2: United Cereals (Chex Quest 3)
From Chex Quest Wiki
Secret areas
Secret area 1: After opening the blue access door and navigating the transporters. Follow the 2nd hallway, and open the unmarked door. Inside there is a vent on the left side of the room. Enter it. At the end of the vent there is chex super-armor suit. Note: getting the yellow key first will save some time.
Secret area 2: After opening the yellow access door walk op a small set of stairs. On the left there is a set of lockers. Open them. Inside you’ll find a suit of chex armor. Make sure you open the lock once inside so that you can continue on with the level.
