CheatOgre.com: Arctic Thunder

Super Boost Wheelie Mode
After startup and before selecting a player, press Y, White, X, R, X, L, Start.

All Randoms Mode
After startup and before selecting a player, press Black, R, X, Y, Black, R, Start.

All Atomic Snowballs Mode
After startup and before selecting a player, press X, X, X, White, Y, Start.

All Grappling Hooks and Randoms Mode
After startup and before selecting a player, press Y, Y, L, Y, Y, White, Start.

All Rooster Tails Mode
After startup and before selecting a player, press Black, R, L, White, X, Start.

All Snow Bombs and Randoms Mode
After startup and before selecting a player, press Y, Y, Black, R, Start.

All Boost Mode
After startup and before selecting a player, press Y, Black, Black, Y, R, Start.

Clone Mode
After startup and before selecting a player, press White, L, L, Y, White, Y, Start.

Everyone Invisible Mode
After startup and before selecting a player, press X, Y, X, R, Y, Y, Start.

Expert Mode
After startup and before selecting a player, press Y, X, Y, Y, X, Start

No Drones Mode
After startup and before selecting a player, press X, X, Y, Y, White, Black, Start.

No Power-Ups Mode
After startup and before selecting a player, press X, X, Y, X, R, X, Start