Star Dash
Finish Star difficulty on all of the six mini-games.

Koopa Castle Stadium
Finish Challenge Mode.

Baby Luigi
Finish Challenge Mode with Yoshi.

Dixie Kong
Finish challenge mode with Donkey Kong.

Hammer Bro
Finish Challenge Mode with Bowser.

Monty Mole
Finish Challenge Mode with Mario.

Petey Piranha
Finish Challenge Mode with Wario.

Toadette
Finish Challenge Mode with Peach.