To perform the cheats, you must first unlock them. To do that, you have to complete the game on any difficult level. Once you complete the final level, the Cheats section becomes available. You can view them by selecting Rewards - Cheats from the Main Menu (path taken from the PC version, but it is almost the same for the other versions too). To unlock a cheat, you must complete a Time Trial. The only available cheats after completing the game are the Sunglasses, Infinite Breath and Textureless mode.

To use a cheat, you have to select it within the game. Once you Pause, select Options and then Cheats. The unlocked cheats are shown in a table. Turn the ones you want On or Off.