Last published challenges
The Completionist
Monty's Garden : Complete the track

A spin on a classic "easy" bridge challenge
Rainbow Road : Go over BOTH Bridges with Petey Piranha, without drifting, without falling

Reach for the Stars
Rainbow Road : Finish in the 1st position with Rosalina, with 15 participants

Waluigi Stadium : Jump off of every Ramp by performing 5 tricks

Dry Bones' Coin Collecting
Wii U/Switch Dry Bone Dunes : Collect all coins with Dry Bones

pass 15 zones
game gear scrap brain : test in Time Trial mode, in less than 30s

DRIVE!!!!!
Rainbow Road 1 : Go for "3 Force Jumps"

Custom Mission 1: Train Racing
Kalimari Desert : Beat the train to the second crossing, in Time Trial mode, in less than 0:16:500

Passing bridges in backwards
Delfino Circuit : Pass 3 Bridges in Time Trial mode, by driving backwards, without touching any box, without falling, without using any item

Setting up 50 Stealth Rocks
Gliscor : Finish the game by performing 25 Super Mini-Turbos

Gliscor tried to use Endure! But it failed! (Gliscor can actually learn Endure, but not in the current generations.)
Gliscor : Finish the game without touching item boxes

Huh. Of all things, the battle arena shaped like a Gliscor is a track Gliscor_F4N didn't get all the challenges on. He did, later, but it's still weird that he didn't do it first thing.
Gliscor : Collect all coins

Pokenatomy
Gliscor : Go to multiple places on Gliscor's body. (Tail, feet, claws, teeth, eyes, and ears)

2 immunities, but stupidity is not one of them...
Gliscor : Finish the game by driving backwards

Uh oh.
THIS IS THE GREATEST PLAAAAAAAN! : Collect 200 coins

*Firetruck blaring* ~End
Steamed Hams! : Collect all coins

Peach's Castle Challenge
Peach's Castle : Finish in the 1st position in VS mode, without drifting

Backwardception
Delfino Square R : Drive a lap but the other way (so turn around at the start) in less than 40s

Don't drift!
bridge pass island : Finish in the 1st position without drifting
With 8 participants

Un pinball con pinchos
Pinball corto. : Finish in the 1st position with Bowser
With 8 participants
