Secret Places (4)

There's a secret place above the lightswitch in the kitchen (close to the ceiling). It is not possible to access this secret using a jetpack (from the kitchen side anyway). It's sort of difficult to reach. Stand on the counter below the "Employees must wash hands" sign. Now face the lightswitch. The goal is to run and jump above the lightswitch while pushing towards the wall at all times. Eventually you'll pop through the wall into the secret. Once you get into the secret place, you'll find that it exits to the outside area. As far as I'm concerned, this secret was done much better in Duke Nukem 64.

Hit the switch under the red access card to open a hidden door. Climb the crates quickly to find the door.

This one is pretty clever. It's in the meat disposal room with the bloody table. Hit the lightswitch to activate a rotating corner. Get behind it to find the secret.

Behind one of the dog cages is a hidden door. Use an explosive to blow up the cage doors. The one with the hidden door is top-left from Scrappy Due's cage.