Load a saved profile or create a new profile.

Then, select the "Extras" option at the main menu. Choose the "Gusteau's Shop" option, then select the "Secrets" option.
Choose a "Code [number]" option and enter the corresponding cheat code to unlock that option.

After a cheat option is unlocked, click on its name to enable it.

Unlocked and enabled cheat options will be saved with the current profile.

However, some cheat options cannot be disabled.

This code cannot be unlocked until it is bought with Gusteau points earned during Story mode.

Gusteaujack - +10,000 Gusteau points (Code 18)
Gusteauomni - +50,000 Gusteau points (Code 19)
Gusteaupot - +5000 Gusteau points (Code 17)
Gusteaures - All Bonus Artworks (Code 12)
Gusteauart - All Concept Art (Code 08)
Gusteaudream - All Dream Worlds in Gusteau's Shop (Code 13)
Gusteauship - All four championship modes (Code 09)
Gusteaucombo - All items in Gusteau's Shop (Code 16)
Mattelme - All single player and multi-player mini-games (Code 10)
Gusteaulevel - All single player mini-games (Code 15)
Gusteauslide - All Slides in Gusteau's Shop (Code 14)
Gusteauvid - All videos (Code 11)
Ilikeonions - Fart when jumping (Code 05)
Hardfeelings - Head butt when attacking instead of tailswipe (Code 06)
Spyagent - Move undetected by enemies (Code 04)
Slumberparty - Multi-player mode (Code 07)
Shielded - No damage from enemies, but still take water and falling damage (Code 03)
Myhero - No impact or damage from enemies, but still take water and falling damage (Code 02)
Pieceocake - Very Easy difficulty (Code 01)