Last published challenges
Ghosts on the Bridge
Boo Boardwalk : Destroy 5 Boos in VS mode, with 1 participant

Piranha Plant Destroyer
Cheddar Challenge : Destroy all Piranha Plants in VS mode, with 1 participant

Planetary Trip
Planetary Trip : Complete the track in less than 2:30 in Time Trial mode, in 150cc

Blue Shell Koopa Unlock
The Confusion Cup : Get the gold cup in Grand Prix mode

MK SC: Riverside Park Coins
Riverside Park (Remastered) : Collect all coins in Time Trial mode, in less than 2:00

COINS
yeah : Collect all coins

Coin's For Mario
Mario Circuit : Collect all coins in less than 1:55, with Mario

Gold Cup
Rareware Cup : Get the gold cup in Grand Prix mode

CHEESE OR CHOCOLATE
Mario Kart Sweet Chocolates And Cheeses : Make at least 5 points in 2 races

don't touch the Cheep Cheeps!
Dire Dire Docks : Complete the track without touching any Cheep-Cheep

Bowser Circuit : Complete the track in less than 6:12 in Time Trial mode, with Toad

Vite vite !!
Swirl Road : Finish in the 1st position by starting with 35s delay

Desert Clean Up
Confusion : Destroy all Piranha Plants in 200cc, in VS mode, with Yoshi, in less than 1:30, with 2 participants

Finish Line
Mario Kart: The Hilarious Tourney : Get all gold cups

Speedin' Past Everzbody
Toadette Circuit : Complete the track in less than 1:35 without using any item

Coin Challenge!
Eradicated DIddy's Jungle Cruise : Collect 25 coins in Time Trial mode, in less than 2:00

1-3: Toad's Challenge
SBOK7 Toad's House : Collect all coins in Time Trial mode, in 150cc, in less than 32s

u
Choco Island 2 : Finish in the 1st position in 50cc, without drifting

CTGPC - Super Cup : Get the gold cup

Mission 6-4: Speed and Stunts
Wii U Excitebike Arena : Complete the track in less than 1:20 in Time Trial mode, in 150cc, with Waluigi, by performing 40 tricks
