DUSK 'Episode 1, 2 and 3's Secret Levels' Guide

I hadn't seen any videos that are specifically just the Secret Levels by themselves,so I decided to make one that had all 3 together. Below are Timestamps, Notes and Tips

TIMESTAMPS

Episode 1 Secret: 00:00
Episode 2 Secret: 01:02
Episode 3 Secret: 04:02

E1M2 - Down On The Farm
E2M4 - Internal Machine
E3M4 - Crypt Of The Flesh

NOTES
Can be done on any difficulty
Can be done with any cheats

WALKTHROUGH
*This is going to be EXTREMELY confusing

E1M2
1. Play through the Level as you normally would
2. When you reach the Shed that has the Red Key, near the back are some barrels. Behind it is a Switch.
3. Hit it, then pick up a Barrel and return to the Hedge Maze. Use the Barrel to climb up top and there should be a small clearing with a Hatch.
4. Open the hatch, hop down and walk through the cave until you reach a clearing.
5. Head left and exit the Level.

E2M4
1. Again, play through the level as you normally would until you reach the end.
2. Make sure to pick up the Grenade Launcher and have some Ammo
3. Near the end, in the giant tunnel right before the Exit is a wall with a crack. Blow it up and enter it
4. When you exit, you'll be in a room with enemies. At the end is a Switch. Hit it then use the teleporter to return
5. When you return, a small vent that was closed will be open. Follow it until you reach a drop.
6. At the bottom is another crack in the floor. Blow it up and enter it.
7. Enter through a tunnel and exit the Level.

E3M4
1. Again, play through the level as you normally would until you reach the end.
2. Near the staircase leading up is a small tunnel. Enter it to return to the start.
3. Hidden behind a wall is a Switch. Hit it to open up a wall.
4. Go through the wall and follow the stairs to a Red Door.
5. Enter it and you'll see a Restroom.
6. Hop on the toilet (On the bowl, not the tank) and hit flush and you'll fall into the Exit
NOTE: If you flush it before you hop on, wait for it to reset and try again