Artic Thunder Codes -

No drones mode:
Before selecting a player, but after the startup screen, push (x2), (x2), , , .

Expert mode:
Before selecting a player, but after the startup screen, push , , (x2), , . 

Every Randoms mode:
Before selecting a player, but after the startup screen, push , , , , , , .

Every Atomic Snowballs mode:
Before selecting a player, but after the startup screen, push (x3), , , .

All Grappling Hooks and Randoms mode:
Before selecting a player, but after the startup screen, push (x2), , (x2), , .

All Rooster Tails mode:
Before selecting a player, but after the startup screen, push , , , , , .

All Snow Bombs and Randoms mode:
Before selecting a player, but after the startup screen, push (x2), , , .

All Boost mode:
Before selecting a player, but after the startup screen, push , (x2), , , .

Clone mode:
Before selecting a player, but after the startup screen, push , (x2), , , , . 

Everyone invisible mode:
Before selecting a player, but after the startup screen, push , , , , (x2), .

No power-ups mode:
Before selecting a player, but after the startup screen, push (x2), , , , , .

Super boost wheelie mode:
Before selecting a player, but after the startup screen, push , , , , , , .

Mooing:
Enter MOO as your initials after a race.