Select the "Extras" option at the main menu. Select the "Cheat Codes" option, then enter one of the following codes to activate the corresponding cheat function.

Level select
Enter GUDGEON as a code.

Unlimited Nova
Enter CAKEDAY as a code.

Invincibility
Enter KRUNKIN as a code.

All mini-games
Enter CURLING as a code.

Weak enemies
Enter CODMODE as a code.

All awards
Enter SNEAKER as a code.

All concept art
Enter FRIVERS as a code.

Rainbow trails
Enter UNICORN as a code.