The Mike code in Deltarune Chapter 4 is 6453. It maps to “MIKE” on a classic phone keypad: 6 = M, 4 = I, 5 = K, 3 = E.

Quick Scoop

  • The door code is 6453.
  • It’s commonly explained as spelling MIKE on an old keypad.
  • Some guides and player posts describe it as the code for Mike’s room in Castle Town’s TV area.

How it works

On a traditional phone keypad, the numbers line up with the letters in Mike’s name, which is why the code is easy to guess once you notice the pattern. That’s the main reason players have been discussing it across guides and forum posts.

Extra context

A few sources mention that the room is tied to optional Chapter 4 content and a boss encounter, but the code itself is consistently reported as 6453. Some community posts also note you can discover it through the game’s return path after finishing Chapter 4.

TL;DR: Mike’s room code in Deltarune Chapter 4 is 6453.