Want to know exactly how to play Megalovania on the piano in Deltarune? You can easily trigger the Chapter 4 Annoying Dog easter egg with these button inputs!
If you’ve been scrolling through gaming communities on platforms like Reddit, X (Twitter), or YouTube recently, you’ve probably noticed a massive spike in clips showing a hilarious new easter egg in Deltarune Chapter 4.
Ever since the highly anticipated Chapter 3 and 4 launched on June 5, 2025, players have been digging into every corner of the game. However, the game doesn’t explicitly tell you how to trigger the secret musical interactions after you finish the main organ puzzle. If you are stuck wondering how to get your own in-game reward for your musical skills, you’re in the right place.
This guide will show you exactly where to find the instrument, the specific inputs you need, and what happens when you play the right notes.
How to Unlock the Deltarune Chapter 4 Organ Puzzle
Before you can start dropping secret melodies, you need to reach the right location and unlock free-play mode.
You will find the giant organ inside the Old Man’s Study, which acts as the hub area for the Dark Sanctuary. However, you can’t reach it right away.
- Defeat Jackenstein: Progress through the chapter until you defeat the Jackenstein boss to obtain the ClaimbClaws.
- Climb to the Organ: Use your new climbing ability to scale the wall in the Old Man’s Study and reach the giant organ.
- Play the Sheet Music: You must complete the mandatory story puzzle first. Use the sheet music provided by the Old Man (Gerson) to play the required tune and open the nearby door.
Important note: You cannot skip the story puzzle. If you try to play Megalovania or any other song before getting the official sheet music, Kris will intentionally fumble the third note every single time. This mechanic works identically whether you are playing on a PC via Steam or using a controller on your Nintendo Switch or PS5.
How to Play Megalovania on the Piano in Deltarune
Once the door is open and the mandatory puzzle is out of the way, you are completely free to experiment with the keys. Here is exactly how to play Toby Fox’s most iconic track.
Exact Button Inputs for PC and Console
The piano mechanics require you to use your directional pad alongside your primary action buttons to change octaves.
If you are playing on a keyboard, you will hold Z for your standard notes and hold C to drop to a lower octave. If you are on a console, this translates to your primary interact button (A/Cross) and your cancel/run button (B/Circle).
To play the opening notes of Megalovania, enter this exact sequence:
- Press Left + Z (Standard Octave)
- Press Left + Z (Standard Octave)
- Press Left + C (Lower Octave)
- Press Down + Z (Standard Octave)
The Annoying Dog Car Easter Egg Explained
The moment you successfully hit that final note, the game rewards you with one of the best visual gags in Chapter 4.
Instead of a deep lore revelation, the Annoying Dog (creator Toby Fox’s iconic white dog avatar) will suddenly zoom across your screen in a tiny toy car, completely running over Kris. It is a quick, hilarious jumpscare that perfectly captures the game’s signature humor.
Other Deltarune Secret Piano Songs You Can Try
Megalovania is definitely the most viral secret, but it is far from the only one. Now that you know how the octave system works, you can play several other melodies to trigger unique, hidden dialogue from your party members.
Lost Girl, Spear of Justice, and Heartache
Try testing out these fan-favorite tracks to see how Susie and Ralsei react:
- Lost Girl (Noelle’s Theme): If you play this sweet melody, Susie will admit that she thinks it sounds nice and wonders if she could learn how to play it on her guitar.
- Spear of Justice: Playing Undyne’s intense battle theme will immediately get Susie hyped up.
- Heartache: Hitting the notes for Toriel’s theme prompts an emotional comment from Ralsei, leading Susie to suggest he should play it for his mom.
- Dark Sanctuary (Chapter 4 Theme): If you play the background music of the area you are currently in, Susie will point out that Ralsei was humming the exact same tune earlier, causing him to get adorably flustered.
Frequently Asked Questions
Can you play Undertale songs in Deltarune?
Yes! Because the two games share a lot of musical DNA, you can play several classic Undertale tracks on the Chapter 4 organ. Alongside Megalovania and Heartache, you can input the notes for Once Upon a Time (which Susie will hilariously call “crap”) or Your Best Friend, which Ralsei thinks sounds incredibly sweet and friendly.
Why does Kris fumble the note in Deltarune?
If you try to spam the Megalovania easter egg to watch the Annoying Dog run over Kris again, the game will actually stop you. If played for a second time, Kris will deliberately fumble the last note. This is Toby Fox’s clever way of preventing players from getting stuck in an endless loop of being run over by a toy car!
Finding these small, highly interactive details is a huge part of what makes the Deltarune community so special. If you haven’t unlocked the giant organ yet, boot up your save file, grab those ClaimbClaws, and start testing out your favorite tracks.
Have you managed to discover any other secret songs while messing around with the piano? Jump into your favorite Discord servers or Reddit communities and share your musical findings with other players!
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