Step 1: When you log into the game, head behind Sid's cashier counter at Biz Mart. There is a Yellow Key item on the counter to the right of the microwave. Click/tap on it to insert it into your inventory.

Step 2: Head to the back of the store by the slushie machine and refrigerators. There is a door with an 'EMPLOYEES ONLY' sign. Head through it to enter the storage room.

Step 3: The door that gains access to the back area of the mart is locked. Go into your inventory and equip the Yellow Key item. While your character is holding it, put the key in the door. The pop-up message should let you know that you unlocked it. Once so, head through it. Note: The door automatically locks again after about 6 seconds once the key is used on it.

Step 4: Once outside, there is a grey crate that appears to be sparkling. Jump onto the crate to teleport to the next area.

Step 5: You will be teleported to the (forbidden) Monochrome dimension! Head inside the house that should be behind you.

Step 6: You'll be inside a very small house with some strange items. There's a television in a corner of the room with static. Have your character physically touch the screen of the TV. Note: Upon touching the TV screen with your character, you will be teleported outside of the main game to an external map. This external map is single player only.

Step 7: After you teleport to an external map, you'll be back in what appears to be an alternative version of the Monochrome dimension. Once again, head back into the house that should be behind you.

Step 8: You'll notice that the house is different. Head straight through the dark hallway until you reach an area with some bookshelves, crates, and other items. Keep following the carpet straight past this area.

Step 9: You'll enter an area with statues on both sides. At the end of the carpet, there is a throne and on that throne is none other than Lucid himself! Get close to him to initiate the conversation upon seeing the prompt pop up. You should also obtain the 'lucid dreams' badge when you're close enough to him. Congratulations! You made it this far!

Step 10: After this, you're practically done! If you wish to return to the main game, you can simply walk back out to where you spawned and hop on the mysterious tomb to teleport you back to the main game so it's easier than just leaving the game altogether.