Deltarune, the beloved RPG by Toby Fox, continues to captivate players with its quirky characters, engaging battles, and hidden secrets. The latest update introduces Chapter 4, packed with new mysteries—including the elusive Motormouth Mike, a secret boss lurking in Castle Town.
If you’re looking to uncover this hidden challenge, our step-by-step guide will help you locate, battle, and defeat Motormouth Mike while also revealing the rewards that await!
How to Unlock Motormouth Mike in Deltarune Chapter 4
Step 1: Enter Mike’s Room in Castle Town
Your journey begins at Mike’s Room, a locked door in Castle Town. To open it, you’ll need a four-digit code: 6543.
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Why this code? It corresponds to a phone keypad:
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6 = M
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5 = K
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4 = I
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3 = E
Together, they spell «MIKE»—the key to unlocking the door.
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Step 2: Pet the Mysterious Cat Statue
Inside Mike’s Room, you’ll encounter several identical statues. Move left until you spot a unique statue with cat ears and whiskers.
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Interact with it to «pet» the statue, causing it to vanish.
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This clears the path forward, but a tall cat statue blocks the way up—ignore it for now.
Step 3: Locate the Terrified Mouse
Continue left to the room’s far end, where another cat statue stands beside a frightened mouse.
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Pet the statue to make it disappear.
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The mouse transforms into a Mouse Arm, granting you the ability to reach previously inaccessible items.
Step 4: Clear the Path with the Mouse Arm
Return to the tall cat statue blocking your way.
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Use the Mouse Arm to pet it, making it vanish.
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Now, proceed upward to discover a microphone-shaped crystal ball and another door labeled «Mike.»
Step 5: Confront Motormouth Mike
Enter the dark room, triggering a surprise encounter:
«Hey, the heck are you doing in here?!»
After a series of cryptic dialogues, Motormouth Mike appears, declaring:
«There’s only one real Mike, and that’s me.»
The battle begins!
How to Beat Motormouth Mike – Battle Guide
The fight against Motormouth Mike is unique, requiring you to follow audio cues and use the Mouse Arm effectively.
Phase 1: Volume Control Mechanics
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A volume bar on the left side dictates your actions:
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«APPLAUSE» (Volume at 100%) → Stay UP
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«SHUT UP» (Volume at 0%) → Stay DOWN
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«NORMAL VOLUME» → Dodge incoming microphones from above and below
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Phase 2: Cat Mike Joins the Fight
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A cat-like enemy appears, summoning multiple cats.
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Use the Mouse Arm to pet them and weaken the boss.
Phase 3: Bigmouth Mike Enters
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Now, Bigmouth Mike attacks with swiping cat paws.
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Keep petting until all three Mikes merge into a single foe.
Final Phase: Merged Mike
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A basket of kittens appears—your goal is to guide the blue parent cat into it while avoiding white cats.
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After several successful pets, the battle ends as the Mikes flee, revealing a shocking truth:
«None of us are actually Mike… We just work here.»
Rewards for Defeating Motormouth Mike
While there’s no direct item reward, you unlock three fun minigames to replay inside Mike’s Room:
| Pluey | Collect blue parent cats for their kittens while dodging white raindrops. |
| Jongler | Toss cats into a red circle using the Mouse Arm. |
| Battat | Smack cats as you move right—bonus points for hitting green ones! |
Want to reset your scores? Use the «Michael Bomb» in the bottom-right corner.
Final Thoughts
Deltarune Chapter 4’s Motormouth Mike is a cleverly hidden boss with a quirky battle mechanic. By following this guide, you’ll uncover one of the game’s best-kept secrets and enjoy some post-fight minigame fun!
Platform(s): macOS, Windows PC, Nintendo Switch, PlayStation 4 PS4 . Nintendo Switch 2, PlayStation 5 PS5Genre(s): Role-playingDeveloper(s): Toby Fox Publisher(s):Toby Fox Engine: GameMaker Studio 2Mode: Single-playerage rating (PEGI): +12
