Top rated challenges

Emerald Pun

Crystal Mines : Locate the Emerald in 7th place

FAILING THE SHOWDOWN!

Duel Dimension : Complete the track in VS mode, with 2 participants, in 2nd place

In difficult mode

No! ...rth.

Duel Dimension : Fall in the Northern-Most part of the map

Shiny but Deadly

Duel Dimension : Go in the Off-road Crystal stuff near the start without falling

I mean...there's only one thing you can bonk. So bonk it.

Mushroom Colosseum : Hint: It starts with the letter "P"

Using one of the Secret Stars

Slideaway Speedway : Get a star, than SLAM into the pipe.

Surviving the Clock-Obstacle Course

Clockstacle Course : Complete the track

Nostalgia

Slideaway Speedway : Get to the end (you can't go backwards) in less than 21s, with Mario, without using any item

Looking for the Blue Coin Switch

Slideaway Speedway : Break the Boxes.

Owch

Oh Snow! : Complete the track

If you unlocked Link, you should also be considered a Master.

Master's Dojo : Finish in the 1st position in VS mode, with Link

A master at Winning by only using the Arrow Keys

Master's Dojo : Finish in the 1st position in VS mode, with Wario, without drifting, without using any item

True Master

Master's Dojo : Complete the track in less than 1:00 in Time Trial mode

Oasis

Désert Yoshi : Trouve l'Oasis près d'une source d'eau...

Maskass's defi

Wii GCN Cookie arènna : Survive more than 1:30 with Shy Guy

Things are going South

Master's Dojo : Break the Southern most Box

Mystery of the Very, Very, VERY Dry Ruins

Dry, Drier Ruins : There's a lone item box sitting by itself in VS mode...go to where it would be in Time Trial mode

As Fast as a Star Bunny

Star Bunny Skyway : Complete the track in less than 2:02 in Time Trial mode

Défi Record

Super Rayer : Complete the track in less than 1:08 in Time Trial mode, with Toad

Défi du Diable

La Route du Diable : Complete the track in Time Trial mode, by falling at most 3 times, in less than 1:30

In difficult mode, no teams