Challenges completed by OCM
It's possible
Bowser's castle : Complete the track in less than 57s in Time Trial mode, in 150cc, by falling at most 1 time

Monty Mole's Dirt Race Challenge
Mole Hill 2 : Finish in the 1st position in VS mode, in 150cc, with Rosalina
In difficult mode, with 8 participants, no teams

Motocross Champion
Motocross Stadium : Finish in the 1st position in VS mode, in 150cc
In difficult mode, with 8 participants, no teams

I just found water!
Crazy dunes : Reach the lake by jumping at the left of the ramp in Time Trial mode, in 150cc, without making tricks, without drifting

The King Of Balloons
Bowser Arena : Hit 6 opponents in 150cc, by losing at most 2 balloons
With 8 participants, no teams

My First Challenge
Rosalina Circuit : Collect all coins in Time Trial mode

Very careful cat
Play misty for me : Complete the track in less than 1:40 in Time Trial mode, in 150cc, without reverse drifting, without falling

Checkpoints
Mienshao plains : Go through the checkpoints in Time Trial mode, in 150cc, in less than 23s

Jumpy Road : Complete the track in Time Trial mode, in 150cc, by performing 50 tricks

?????
Jumpy Road : Complete a lap in Time Trial mode, in 150cc, in less than 6s

Race to Win!
Desert Hills : Finish in the 1st position in VS mode, in 150cc, in medium mode, with 2 participants

Mama Mia !
Mario Speedway : Finish in the 1st position in VS mode, in 40cc mirror, with Mario
In difficult mode, with 8 participants, no teams

Trial 1 test of skill
Simple plains : Finish in the 1st position in VS mode, in 100cc mirror, with Mario, in easy mode
With 8 participants, no teams

Destroy Spiny caterpillars
Blazing Oasis : Destroy all Pokeys in VS mode, in 150cc

Alpine madness
Sneek-a-Peek : Complete the track in less than 1:40 in VS mode, in 300cc, with 1 participant

Bowser's Messy Castle
Bowser Castle 1 : Complete a lap in Time Trial mode, in 150cc, without being hit by a fake item box, a banana, a green shell, a red shell, a bobomb or a poison mushroom, in less than 35s

Eyerok Battle
Eyerok Arena : Destroy 1 Eyerok (right hand) and 1 Eyerok (left hand) in 150cc, without losing any balloons, with Mario, with 1 participant

Get Away, Goombas!
Mario Circuit : Destroy all Goombas in Time Trial mode, in 150cc, with Mario (GBA)

???
Rainbow circuit 2 : Collect 45 coins in Time Trial mode, in 150cc

Rank 3 of the rainbow
Rainbow fun : Complete the track in less than 40s in Time Trial mode, in 150cc
