Type any of the following codes on the keyboard while in any of the game's front-end menus. A notification popup should appear on screen notifying you of a successful cheat input. CHEATS can be turned on and off, and must be reactivated whenever the player returns to the main menu after a game-over.

Code	Effect
BlackAlbum	Makes Nyan Cat completely black.
CatBreadForTheWin	Replaces all yummies with Cat Bread!
ChocoKittyTart	Makes a Chocolate Pop-Tart Themed Nyan Cat.
ColdWintersDay	Makes Nyan Cat move slowly from lane to lane.
DivideByZero	Makes Nyan Cat invert the color of whatever is behind it.
DownInFront	Moves Nyan Cat far up the screen.
DreamsComeTrue	Makes Nyan Cat flash rainbow colors.
ForgotMyGlasses	Makes Nyan Cat blurry and nearly invisible.
FunkyFace	Modifies the bottom-screen text notifications in game.
GGGGhostNyan	Makes Nyan Cat transparent.
InvisibilityCloak	Makes Nyan Cat completely invisible.
Leprechaunitis	Disables Nyan Cat's rainbow.
NyanCatMarch	Replaces bottom-screen text notifications with a parade of Nyan Cats.
NyanFisher	Makes Nyan Cat stealth themed (a la Sam Fisher)
NyanOLantern	Makes Nyan Cat Hallowe'en-Themed.
NyanStamp	Embosses Nyan Cat.
NyanTheDarkLord	Makes Nyan Cat black and glow red. Red glow is retained after reloading the game, black is not.
OUTFITS	Immediately change the appearance of the Nyan Cat itself.
OmNomNomable	Changes "Nyans" to "Noms" in gameplay.
ReverseEngineering	Reverses the galaxy horizontally, and inverts the rainbow trail.
SnookiesCookies	Changes the word "cookies" to "Snookies" in the text notifications.
SummerNyan	Turns Nyan Cat into a watermelon.
TastingTheRainbow	Reverses Nyan Cat.
UseYourWhiskers	Disables the HUD.
VertigoKitty	Flips the galaxy upside-down.
WhiteAlbum	Makes Nyan Cat completely white.
YouLookLikeAPopTart	Makes Nyan Cat white, pink and purple.