Over the course of a long story with many twists and turns,Mario & Luigi: Brothershipis littered with a bunch of optional side-quests which range from great fun to baby’s first quest. Some ofthe best items are hiddenwithin these quests to encourage you to complete them.
Many of these quests also explore the cast and give you reasons to really appreciate each and every character. With the already drawn-out adventure, you may want to choose wisely which quests you should do. You should come take a look through some of the best to complete that are worth your time.

Some of these are “Special Quests”, which will disappear after you progress in the story, so we recommend completing these as soon as they become available. We have labeled which these are and detailed the points at which they unlock.
12How’s Bowser’s Health?
An Inside Story Callback (Special Quest)
Heading on over to Wayaway Island after completing Jellyfish Island, this quest involves Starlow going to visit her friend to see how he is. To the shock of all, that friend is Bowser. A cutscene follows of the two catching up, Bowser calls Starlow by the nickname Chirpy, calling back to Bowser’s Inside Story, which is where this originates.
The gear given for completing this is the Bowser Spikes Gloves. These increase your POW by 20% but reduce your HP by 10% of its max every turn you attack. While this may seem like a huge downside which makes these pretty awful, if you combine these withsome good healing Battle Plugs, the massive increase in POW becomes worth the risk.

11A Dear Friend
The Best Buddies For Life (Special Quest)
This quest starts on Shipshape Island after completing Offabandon Island as Buddy is seen crying. After chatting with him, he will rush off back to the island to find Bowser Jr. Following him, we see Bowser Jr. having a bad tantrum while Buddy listens without him knowing.
Buddy then runs away, hurt by what he hears, but shortly after, Bowser Jr. remembers the good times the two had and goes to make up with his friend. While not rewarding you with much, this quest’s character development alone is worth doing it for, and we highly recommend it.

10More Than One Code
Unlock The Treasure Behind The Code
This fun quick quest filled with character will task you with becoming a spy for just a moment. Traveling to Lottacoins Island, you will find a little yellow Concordian who asks you to help him with a super-secret spy mission to obtain a treasure.
By entering the number 3479 in the treasure room, you will receive a gift box containing a Gold Medallion. The Gold Medallions are limited and valuable. Not only do they boost every stat,making them one of the best accessories, but they also sell for a large sum. Meaning that even if you already have one for each brother, you can still make good use of another.

9Zokket’s Schemes
Evil Plans Are Underway (Special Quest)
Make sure to hurry over to this quest after completing Desolatt Island by talking to IDLE on Shipshape Island. By finding and traveling to Minmin Islet, this quest is the first time the main villain, Zokket, meets Mario and Luigi. Seeing him meet the brothers and deem them as nothing worth his time creates a menacing first impression.
This quest also gives you the Accel Boots, which are great for increasing your speed. Every time you defeat an enemy in battle with them, it will increase by 30%, making them valuable for many reasons.

8The Empty Nests
Wedded Away From Home
One of the sweetest parts of the main story is the wedding on Heatfreeze Island. This leaves a frozen burnt hole in your heart once it is over. Luckily for us, this quest has you checking back in on the couple, Chilliam and Burnadette, seeing them at their happiest.
They are both worried about their fathers, who are now alone at home. This then leads to you going to meet them and receiving some precious flashback moments. In the end, the couple were worrying too much, and they thank you with the Antiair Boots DX, which has the bonus of dealing 30% extra damage to flying enemies.

7The Lonely Great Conductor
A Tasty Treat To Help
Returning to Conductor Island after completing it, the Great Conductor asks you to fetch him something tasty. After Snoutlet refuses this request due to more pressing matters at hand, The Great Conductor suddenly has a headache and requires something sweet and cold to make him feel better.
This is not only a fun quest, as we get more time with the best guardian of Concordia, but the item given as a reward is pretty strong. After helping him, the Great Conductor will give you Great Conductor Wear, which gives a huge +128 Defense and +12 Speed, which will make the wearer into a tank.

6Glohm Gobblick
Glohm Powered Rematch With The Flytrap Foe
After completing Slippenglide Island, you can talk to Dewey Fightem on Shipshape Island to start this quest, which will lead you to a Glohmed version of the Gobblick boss. This will not only test your skill but give you some useful items for defeating future Glohm enemies.
You will receive both the Anti-Glohm Specialist Battle Plug alongside the Gobblick Boots DX. The Battle Plug is a must-have item that makes all attacks deal critical damage to any Glohm enemies. The Boots are also a great pickup as they have the bonus effect of healing 10% of any damage you deal.

5Technikki’s Past
A Genius With Doubts (Special Quest)
After completing Offandon Island, you’re able to find Technikki aboard Shipshape Island where she is acting strange. Snoutlet suggests that you should head to her workshop on Merrygo Island to find the confidence that she said she left behind.
A flashback helps us better see Technikki as a relatable and understandable character as she was trying to be the best genius, which made her become unhappy with her own work. She gives you a special item after, the Technikki Wrench, which increases max BP by 30% and POW by 10% but has downsides of decreasing all your other stats slightly.

4Dueling Geniuses
Working Together To Spark Brilliant Ideas (Special Quest)
Heading to Jellyfish Island after completing it, you should talk to Adaphne, who has an idea for some Boots for Luigi she needs help with. Optionally, you’re able to then head to Shipshape Island to talk to Technikki, which will lead to you getting a better reward for her help in improving the idea.
These two have had quite a history, so seeing them work together is a nice change. After returning to either of them with three Zokket Alloys, you will be given the Adapnikki Boots, which boost all jump attack damage by 30%.

3Glohm Sharpcask
A Corrupted Second Brawl With The Barrel Boss
After returning from Wayaway Island, you’re able to talk to Dewey Fightem on Shipshape Island to venture back to the Great Lighthouse Island found in the Color-full Sea and fight a harder Glohmed version of the Sharpcask boss whichis one of the best bosses.
This tricky boss will reward you greatly with the Sharpcask Hammer DX. An excellent Hammer for any multi-enemy battle, as every time you defeat an enemy it will increase your defense by 30%. This makes this Hammer useful for any bosses or enemies that summon allies.