Some elements of Paper Mario: The Thousand-Year Door (TTYD) are missable and cannot be triggered or seen again in your playthrough of the game. Read on to learn which to look out for and how to make the most of your playthrough!

All Missable Content in Paper Mario TTYD

1. Lumpy's Investments
2. Yoshi's Name and Color
3. Whacka Bump will Stop Appearing After 8 Attacks
4. Treasure Chest in Chapter 8

Lumpy's Investments

A rat in Rogueport names Lumpy will ask Mario for some coins to invest into something. Lumpy will accept coins from the start of the prologue up until Chapter 4, after which you will not be able to give him more coins.

If you give Lumpy coins, you'll be able to reap profits after Chapter 6, where Lumpy will return your coins.

How to Get Coins Fast

Yoshi's Name and Color

The name and color of Yoshi, who joins your party in Chapter 3 can no longer be changed later. Yoshi's color is determined by how much time you spend with the egg.

Yoshi's name and color have no effect on his abilities, but be mindful if you care about his appearance.

How to Choose Yoshi Colors in Paper Mario TTYD

Whacka Bump will Stop Appearing After 8 Attacks

Whacka is an NPC in Pirate's Grotto who drops the recovery item, Whacka Bump, which can recover 25 HP and FP. However Whacka will no longer appear after 8 attacks, which means only 8 pieces of Whacka Bump can be obtained.

Pirate's Grotto Collectibles, Enemies, and Points of Interest

Whacka Appears as a Post Game Secret Boss

After hitting Whacka eight times, it will stop appearing in Pirate's Grotto. Secretly, it will move to the lowest floor of the Pit of 100 Trials dungeon, and you can fight it as a secret boss after clearing the game and defeating Bonetail, which means that you need to clear the dungeon a second time if you want to fight Whacka.

This is one of the few new additions in the Switch remake of Paper Mario TTYD, as Whacka cannot be fought as a boss in the original GameCube version.

How to Defeat Whacka

Treasure Chest in Chapter 8

The treasure chest is located after destroying the wall in the room where you fought Gloomtail. It will become impossible to get if you progress further as it will transform into a staircase.

It contains Ultra Shroom and Jammin' Jelly, which are recovery items that can help you in battle.

Ultra Shroom and Jammin' Jelly

Missing this treasure chest is not that impactful to your gameplay. Ultra Shroom and Jammin' Jelly are good recovery items, but they can also be obtained from shops or from cooking.

List of Recovery Items

Non-Missables in Paper Mario TTYD Switch Remake

1. Mario's Stats When Leveling Up
2. Partner's Stats When Ranking Up
3. Enemies That You Cannot Fight Again
4. Shine Sprites and Star Pieces

Mario's Stats When Leveling Up

Whenever Mario levels up, you are given the option to increase HP, FP or BP. This can be adjusted later on in the game by paying 39 coins to the NPC, Chet Rippo who you will meet after completing Chapter 5.

How to Respec and Adjust Stats

Partner's Stats When Ranking Up

Your party's stats also increase when they rank up. These stats can also be adjusted with Chet Rippo, similar to Mario, if you don't want to use more Shine Sprites.

How to Upgrade Party Members

Enemies That You Cannot Fight Again

A trash can in Professor Frankly's house contains Tattle Logs of enemies or non-recurring enemies you may have missed.

All Enemies in Paper Mario TTYD

Enemies in Glitz Pit can be Rematched After Chapter 3

After you've completed Chapter 3, you can challenge the Glitz Pit again and find enemies you may have not seen via exhibition matches.

Glitz Pit Collectibles, Enemies, and Points of Interest

Shine Sprites and Star Pieces

Collectibles like Shine Sprites and Star Pieces are necessary for ranking up Mario and your party members. These can also be used for badges which are useful for completing chapters.

All Collectible Locations

Paper Mario: The Thousand-Year Door Related Guides

Tips and Tricks

Game Mechanics Guides

All Game Mechanics Guides
How to Level Up Fast	Best Level Up Bonus
How to Save the Game	Is There Online Multiplayer?
Coin Farming Guide	How to Store Items
List of Controls	All Missable Content
All Paper Mario Abilities	Plane Mode Guide
Best Partner Upgrade Order	How to Upgrade Partners
How to Get Second Partner Upgrade (Lv. 2)	All Partner Abilities
How to Respec and Adjust Stats	Merluvlee Hints Guide

Battle Mechanic Guides

All Battle Mechanic Guides
Battle Mechanics	What Happens When You Die?
Audience Mechanic	How to Charge Star Power
How to Trigger Bingo	How to Guard and Superguard
How to Recover HP	How to Recover FP
Stats Explained	Do Badges Stack?
List of All Status Effects	Danger Mario Build

Pianta Parlor Game Guides

Pianta Parlor Game Guides
Plane Game	Paper Game
Tube Game	Boat Game

Other Guides

Other Guides
Pit of 100 Trials Guide	Pianta Parlor Guide
Post Game Content Guide	How to Choose Yoshi Color
How to Get Up Arrow	Super Fun Quirk Quiz Answers
How Long to Beat the Game	All Zess T. Recipes
Partner Ring Feature	How to Unlock the Pipe Room
Who is the Mayor of Petalburg	Merlee's Fortune Telling Guide
Boo's Quiz Answer	All TEC Quiz Answers
What is the Ghost's Name?	Best Zess T. Recipes
Where to Find Bobbery in Rogueport	Lumpy Investment Guide
Stump Petuni Guide	Happy Lucky Lottery Guide
Watering Hole Location	Podley Location
All Emails	-