Challenges completed by popolo
Wii U Toad Harbor : Collect all coins

Big Blue : Collect all coins

Dropped Coins in the Oil Factory
Oilfield Outpost : Collect all coins with Toad

Cue Ball Circuit : Collect all coins

Outrun Beach : Collect all coins

Misplaced Ring!
Bumpy Country : Collect 1 coin in Time Trial mode

[ONE LAP ONLY] Magic Mid-raceway (Magical Midway) : Complete the track by performing 15 Super Mini-Turbos

Wii Rainbow Road : Collect all coins

Let's face it - wheelspin, where the wheels of a car have no traction and spin, is bad for speed, regardless of if it gives a speed boost. Try completing this course without drifting at all!
Looping Circuit : Complete the track without drifting

test coins
test #1 : Collect all coins

Pipe
Pipe Track : Complete the track in 50cc class

Sunshine Run
MKT Los Angeles Laps : Collect all coins

The. Last. Of. Us.
MKT Los Angeles Laps : HINT: MKT Los Angeles R

IM RUNNING OUT OF NAMES
MKT Los Angeles Laps : Take the shortcuts

Mario Loves Yoshi
GCN Yoshi Circuit : Complete the track with Mario

Yoshi's Island
GCN Yoshi Circuit : Complete the track with Yoshi
