Monster Mania: Level 3 is a side quest in Mario & Luigi: Brothership that can be started on Petit Islet after completing Jellyfish Island. Read on for a full walkthrough of Monster Mania: Level 3, including its location, unlock requirements, and rewards.

Monster Mania: Level 3 Location and Unlock Requirements

Monster Mania: Level 3 Side Quest
There's a fearsome monster on Petit Islet. A champion is needed to defeat it!
Unlock Requirements	Complete Jellyfish Island
Quest Start Location	Petit Islet

Unlocked After Completing Jellyfish Island

After you complete Jellyfish Island, you will be able to find this side quest on Petit Islet. Talk to the Monster Mania member in a white suit on the eastern end of Petit Islet in order to start Monster Mania: Level 3.

If this side quest doesn’t appear for you after you return to Shipshape Island from Jellyfish Island, you may need to progress the story a little bit.

Story Walkthrough

Recommended to Be Level 41

This side quest involves defeating enemies to complete it. It is recommended to have Mario and Luigi to be at least level 41 to easily complete this quest.

Available After Getting Through the Fortress Zocket Barrier

This quest unlocks once you have built either Technikki’s flying engine or Adaphne’s submarine engine and have made it past the Fortress Zokket barrier.

The new engine allows you to jump to any current instantly, including the disconnected currents such as the one Petit Island is on.

Technikki or Adaphne? Which Engine Should You Choose?

Monster Mania: Level 3 Walkthrough

Talk to Maniac No. 3 on Petit Islet

Set your course for the isolated current at the top right corner of the Brrrning Sea, then fast-travel to it using Shipshape’s new engine by pressing Y. Petit Islet should be floating around here.

Use the Big Cannon to launch Mario and Luigi to Petit Islet, then head to the right side of the islet to find Maniac No. 3. When he asks if you can beat his enhanced Curlup, say Yes in order to start the quest.

List of All Islands and Islets

Defeat the Curlup R

Talk to the Monster Mania member again to start a battle with a strong level 40 Curlup R. This battle isn’t too difficult, but it may take a while because of the monster’s high HP. Just try to focus on offense and use your strongest attacks.

To help you inflict more damage, it’s recommended to equip the Surprise Iron Ball plug and the Fiery Attack plug. If you manage to burn the Curlup R, it will also take damage every turn.

Once burned, focus on using Bros. Attacks, since they tend to be stronger than your standard Hammer and Jump attacks even with Battle Plugs helping you out.

Curlup Dodge and Counter Strategies

Monster Mania: Level 3 Rewards

Max Nut and Heart Bean

Reward	Description
Max Nut x2	Restores each brother's HP by 110.
Heart Bean x2	Adds 1 to max HP.

After defeating the Curlup R, you will be rewarded with two Max Nuts and two Heart Beans. Heart Beans are also what Maniac No. 3 fed the Curlup to make it stronger.

How to Heal and Restore Health

Mario & Luigi: Brothership Related Guides

All Side Quest Locations

Lushgreen Sea Side Quests

Color-Full Sea Side Quests

Brrrning Sea Side Quests

Gulchrock Sea Side Quests

Stormstar Sea