Mike's Room is a secret room in Deltarune Chapter 4 that asks you for a passcode. Found in the TV building in Castle Town, opening this door can lead you to a secret boss fight and also grant you access to some interesting perks. The code is made up of the corresponding letters for each phone number that you come across in Chapter 4.
The code for Mike's Room in Deltarune Chapter 4 is 6453. This will let you enter the chamber and explore at will. Read on for more.
Mike's Room in Deltarune Chapter 4

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As just mentioned, the code for Mike's Room is 6453. You can enter it when you approach the door, and the prompts ask you to enter the 4-digit code. Once done, the doors will open up and you'll enter the narrow hallways inside.
You will come across many statues in these hallways. Many of these do nothing, and as you keep moving along, you'll find statues with cat ears. You can pet these statues and they will instantly disappear.
Further down the path, more statues with cat ears will appear; however, some of them are too tall for you to be able to pet them. So, continue moving down the path, and you will come across a tiny mouse shivering in fear of a cat statue. This statue is within reach and can be petted; once you do, it disappears.
Once the statue is gone, the mouse befriends you and turns into a long hand that can be used to pet taller cat statues. You can use this to make way for yourself and also collect all the hats kept on the wall. Use it to open a drawer in the hallway and pet all the cat statues in Deltarune Chapter 4.
One of these statues will give you a treasure chest, and once you make them all disappear, you can save the game file and also access the mic-shaped crystal ball. Interact with it and then with the door to enter the secret boss fight against Motormouth Mic.
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