Challenges completed by Sponge-Robert
All's Golden
Starl Kart 2: Get all gold cups
Difficult Master of rails
Rolling Sky 2: Complete the track in Time Trial mode, without falling, while constantly accelerating
Extreme Rolling Sky 2: Complete the track in Time Trial mode, while constantly accelerating
Difficult Flower GP Winner
Flower Cup: Get the gold cup in Grand Prix mode, in 150cc
Medium Metal Mario & Pink Gold Peach's Challenge
Rainbow Road: Finish in the 1st position in VS mode, in 150cc, with 3 participants
In difficult mode, no teams
Medium Mushroom GP Winner
Mushroom Cup: Get the gold cup in Grand Prix mode, in 150cc
Medium