Last published challenges
Wii U Thwomp Ruins : Take the first shortcut.

Beat Me
Impossible castle : Complete the track in VS mode, without drifting
No teams

Ne tombe pas!!! ;) ;) ;)
Arène bataille Toad64 : Finish the game in the 1st position without falling, without drifting
No teams

Quick Turns!
DS Mission 2-3 : Complete the track in less than 16s

Bup Bup Battlefield
Bob-omb Battlefield : Complete the track in less than 1:40 in Time Trial mode, with Toad

Speeding down the waterfall
Wii U Shy Guy Falls : Complete the track in less than 1:48

inspéction de @FireToad
Forêt Des Fantômes : cette zone est difficile à trouver mais une inspéction de FireToad vous suffiras à le trouver... ;)

Behind Chain Chomp's Gate
Bob-omb Battlefield :

Shoot to the Island in the sky
Bob-omb Battlefield :

King Bob-omb on the Summit... at least he was
Bob-omb Battlefield :

Tie/Beat my Gasless Score
Remix Cup Redone : Make at least 38 points in 4 races in Grand Prix mode

Lakitu VS His Clouds
Lakitu's Fun Awesome Skydiving Adventure : Finish in the 1st position in VS mode, with Dry Bones, with 5 participants, in easy mode

PrototypeBlurple vs Stickman
PrototypeBlurple's Pacific Island : Finish in the 1st position in VS mode, with 7 participants, with Daisy, in easy mode

Snow is his rival
Liamisbest Snowy Fun Adventure : Complete the track in VS mode, with Daisy, with 4 participants, in medium mode

Goomba08 Likes Goombas
Goomba08's Awesome Mansion : Complete the track in VS mode, with 4 participants, with Koopa

Coupe Or
Mario Kart 1 (O) - Blue Shell Cup : Get the gold cup in Grand Prix mode
With 8 participants

You're Not Waterproof
Learn to Hop : Complete the track by falling at most 2 times

Challenge on a Challenge ._.
Mission 2-6:One Item,Eight Players : Hit 4 opponents
No teams

MKR 4-Oh god...
Shell Cup : Get the gold cup

The Name of the Track is the Main Challenge
I dare you to play this with 100 cpu : Finish in the 1st position with 100 participants
