Parental Lock Code Puzzle Explained

July 26, 2025

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In Deltarune Chapter 3, after the first two Marvelous Mystery Boards, you’ll come across a TV remote guy called a Zapper. After telling him you won’t fight or pushing his buttons a few times, you’re taken into a long, dark hallway.

These rooms are a series of puzzles that represent Parental Locks that Toriel put on something in the Dreemurr home in order to keep Kris from seeing some inappropriate media, and can be a bit hard to crack.

Deltarune Chapter 3 100 Percent Guide, featuring the Rhythm Game, Egg Room, and the Gacha Machine.

We’re getting everything, even the weird stuff.

This puzzle gates off progression to the rest of the chapter, and has you entering numbers from the screens on display, after manipulating things in the game to show you exactly what the codes are.

In this article, I’ll be explaining how you solve these puzzles, and in the end, telling you the code to each door. You can simply enter that if you don’t wish to solve the puzzle yourself, as they’re consistent on every playthrough.

First Door

This first room is an example of what you’ll be doing for the next few doors, but it can be a bit tricky in its own right. First, interact with the parental lock door, input anything, then interact with the console on the middle screen.

If you’ve taken the steps to fight the Secret Boss of Chapter 3, Kris will have a sword and can slash at the grass, rocks, and switches to reveal the numbers; otherwise, you can simply use Susie to do the same thing.

The numbers read 123, but you need to input them in the order you travel through them, with the leftmost side, middle room, then rightmost side, making the code read 213 instead: the correct combination.

How to S-Rank the Chapter 3 Minigames in Deltarune Thumbnail

Just don’t try for the T Rank, it’s not worth it.

Second Door

Much the same as the previous one, interact with the door, input anything, then interact with the console by the middle screen, where you’ll once again be playing as Kris with a sword, or as Susie.

If you’re Kris, you can just head over to the bottom right screen, which is at the top right of the map, and slash open the door. If you’re Susie, though, it will be a bit more complicated to catch the key.

Deltarune Chapter 4 100% Guide thumbnail

Strap in, this one’s a doozy.

Find the bottom right corner where the two blocks are, throw one at the top right of this screen, and the other up and to the right of that block, which should catch the key and let you grab it after a loop around.

Once you’re in the locked door, you’ll see a bunch of split-up numbers, with the same solution as before, now a bit more jumbled around. When unjumbled, they spell out 1225, aka 12/25, aka Christmas, aka December Holiday, and also the code to the door.

Third Door

Screenshot of Deltarune, with dialogue stating that you Tried to Use the Console.

This one’s a quickie. If you didn’t do the SWORD route for the secret boss, then you’ll have one last door in the way, a Parental Lock that seems undefined. It’s easy enough: just enter in all zeroes, and you’ll be free to go.