Bowser Board:
To play in the bowser themed board, finish story mode with any character.

Daisy's Room Unlockables:
Beat Toad in Story Mode with Daisy to unlock Daisy's Bed
Beat Goomba in Story Mode with Daisy to unlock Daisy's Flowers
Beat Shy Guy in Story Mode with Daisy to unlock Daisy's Table
Beat Boo in Story Mode with Daisy to unlock Daisy's Side Table
Beat Koopa in Story Mode with Daisy to unlock the Daisy Doll
Beat Bowser in Story Mode with Daisy to unlock the Bowser Teapot
Source: Brady Games' Guide

DK's Room Unlockables:
Beat Toad in Story Mode with DK to unlock DK's Barrel
Beat Goomba in Story Mode with DK to unlock DK's Tree
Beat Shy Guy in Story Mode with DK to unlcok DK's Stand
Beat Boo in Story Mode with DK to unlock DK's Box
Beat Koopa in Story Mode with DK to unlock the DK Doll
Beat Bowser in Story Mode with DK to unlock the Bowser Object
Source: Brady Games' Guide

Luigi's Room Unlockables:
Beat Toad in Story Mode with Luigi to unlock Luigi's Table
Beat Goomba in Story Mode with Luigi to unlock Luigi's Airbike
Beat Shy Guy in Story Mode with Luigi to unlock Luigi's Dumbbell
Beat Boo in Story Mode with Luigi to unlock Luigi's Chair
Beat Koopa in Story Mode with Luigi to unlock the Luigi Doll
Beat Bowser in Story Mode with Luigi to unlock the Bowser Television
Source: Brady Games' Guide

Mario's Room Unlockables:
Beat Toad in Story with Mario to unlock Mario's Sofa
Beat Goomba in Story Mode with Mario to unlock Mario's TV
Beat Shy Guy in Story Mode with Mario to unlcok Mario's Table
Beat Boo in Story Mode with Mario to unlock Mario's Fridge
Beat Koopa in Story Mode with Mario to unlock the Mario Doll
Beat Bowser in Story Mode with Mario to unlock the Bowser Vase
Source: Brady Games' Guide

Ming Games in Thwomp's Backroom Ball:
Mega Board Mayhem is initially available
Mini Board Mad-Dash is initially available
Panic Panel is unlocked by playing Panels of Doom on the Bowser's Gnarly Party board
Challenge Booksquirm is unlocked by playing the Booksquirn minigame
Jigsaw Jitters is unlocked by playing the Photo Finsh minigame
Barrel Baron is initially available
Mushroom Medic is initially available
Doors of Doom is initially available
Bob-omb X-ing is initially available
Goomba Stomp is unlocked by playing the Tree-Stomp minigame
Ztar (Beach Volley Folley) is unlocked by completing the above 10 minigames

Mini-Game Room Unlockables:
Clear a 40 piece puzzle in Jigsaw Jitters in 3:00 or less to unlock the Toad Plate
Clear 15 pages or more in the Bookworm (or the Challenge version) minigame to unlock the Goomba Plate
Clear Dungeon Duos within 1:30 to unlock the Shy Guy Plate
Dive for 7 or more seconds in Take A Breather to unlock the Boo Plate
Clear Right Oar Left? within 0:45 to unlock the Koopa Plate
Clear Mario Medley within 1:00 to unlock the Bowser Plate
Clear a 30 piece puzzle in Jigsaw Jitters in 2:00 or less to unlock Toad's Teapot
Clear Beach Volley Folley's Tourney mode to unlock the Birthday Cake
Knock down 100 or more dominos in Domination to unlock Goomba's Clock
Clear Mario Speedwagons in 0:10 or less to unlock Boo's Photo Stand
Clear a 20 piece puzzle in Jigsaw Jitters in 1:00 or less to unlock Toad's Cup

Peach's Room Unlockables:
Beat Toad in Story Mode with Peach to unlock Peach's Chair
Beat Goomba in Story Mode with Peach to unlock Peach's Table
Beat Shy Guy in Story Mode with Peach to unlcok Peach's Clock
Beat Boo in Story Mode with Peach to unlock Peach's Treasure Chest
Beat Koopa in Story Mode with Peach to unlock the Peach Doll
Beat Bowser in Story Mode with Peach to unlock the Picture of Bowser

Present Room Unlockable:
Obtain all of the items in the other 9 rooms to unlock the Birthday Star Trophy
Source: Brady Games' Guide

Taunt:
Press the ''L'' button during your opponents turn on the game board to have your character taunt by saying something.

Unlock "The Final Battle":
To unlock the mini-game ''The Final Battle'' in the etc. menu, simply complete Story Mode once with any character on any difficulty.

Unlock Bonus Mini-Game Lists:
To unlock the Custom Mini-Game List, make one
To unlock the first Bonus List, beat Bowser in Story Mode
To unlock the second Bonus List, play Bowser Wrestling on the Bowser's Gnarly Party board
To unlock the third Bonus List, play Panels of Doom on the Bowser's Gnarly Party board
Source: Brady Games' Guide

Unlock Etc. Mini-Games:
To unlock the etc. mini-games ''Bowser Wrestling'' and ''Panels of Doom'', pass Bowser on Bowser's Gnarly Party when you're Mega (after using a mega mushroom). He will challenge you to either of these mini-games.

Unlock Expert Difficulty:
To unlock Expert, beat Story Mode on Easy, Medium, and Hard.
If you thought CPU opponents were too easy before, you're in for a pleasant surprise. ;-)

Waluigi's Room Unlockables:
Beat Toad in Story Mode with Waluigi to unlock Waluigi's Calendar
Beat Goomba in Story Mode with Waluigi to unlock Waluigi's Shelf
Beat Shy Guy in Story Mode with Waluigi to unlock Waluigi's Shower
Beat Boo in Story Mode with Waluigi to unlock Waluigi's Chair
Beat Koopa in Story Mode with Waluigi to unlock the Waluigi Doll
Beat Bowser in Story Mode with Waluigi to unlock the Bowser Bath
Source: Brady Games' Guide

Wario's Room Unlockables:
Beat Toad in Story Mode with Wario to unlock Wario's Motorbike
Beat Goomba in Story Mode with Wario to unlock Wario's Box
Beat Shy Guy in Story Mode with Wario to unlcok Wario's Recliner
Beat Boo in Story Mode with Wario to unlock Wario's Hamburger
Beat Koopa in Story Mode with Wario to unlock the Wario Doll
Beat Bowser in Story Mode with Wario to unlock the Bowser Clock
Source: Brady Games' Guide

Yoshi's Room Unlockables:
Beat Toad in Story Mode with Yoshi to unlock Yoshi's Egg
Beat Goomba in Story Mode with Yoshi to unlock Yoshi's Computer
Beat Shy Guy in Story Mode with Yoshi to unlcok Yoshi's Table
Beat Boo in Story Mode with Yoshi to unlock Yoshi's Shoes
Beat Koopa in Story Mode with Yoshi to unlock the Yoshi Doll
Beat Bowser in Story Mode with Yoshi to unlock the Bowser Light
Contributed By: bluberry, Source: Brady Games' Guide