Just like Guitar Hero World Tour and Guitar Hero: Metallica, Guitar Hero: Smash Hits also shares the same type of Cheat Menu where you press Green Fret to Blue Fret and cheats are only 8 digits long. The cheats in Guitar Hero: Smash Hits are the same cheats in Guitar Hero: Metallica except the "Metallica Costumes" cheat is not available since that cheat is only for Guitar Hero: Metallica but button combinations are different.
Cheat
Input and notes
Air Instruments
Y→R→B→G→Y→R→R→R
Makes all instruments invisible.
"Air Instruments" and "Invisible Rocker" cannot be enabled simultaneously.
This cheat makes all cash earnings to be $0 when playing Drums.
This cheat does not work in Career (solo or band) or online play.
Extra Line 6 Tones! (PS3, X360)
G→R→Y→B→R→Y→B→G
Unlocks extra Guitar Effects in the Music Studio for Lead Guitar and Rhythm Guitar.
This cheat is always active.
Flame Color
Y→B→R→G→Y→R→G→B
Alters the color of the flame on top of your frets when playing notes.
Alters the color of the Star Power Overdrive that are on the side of the highway when activating Star Power.
Colors you can choose from are: Normal, Pink, Stealth, Eggs & Bacon, Old Glory, Solid Gold, Platinum, Diabolic, Toxic Waste, Black, Pastel, Dark, and Outline.
Gem Color
R→R→R→B→B→B→Y→G
Alters the color of the notes on the highway (except when Star Power is activated).
Alters the color of your fret bar.
Colors you can choose from are: Normal, Pink, Stealth, Eggs & Bacon, Old Glory, Solid Gold, Platinum, Diabolic, Toxic Waste, Black, Pastel, Dark, and Outline.
HyperSpeed
R→G→B→Y→G→Y→R→R
Unlocks "HyperGuitar", "HyperDrums", and "HyperBass" cheats.
Toggling through numbers 1–5 stretches and increases the scrolling speed of the highway for that instrument (HyperGuitar for Guitar, HyperDrums for Drums, and HyperBass for Bass), as well as distancing notes away accordingly. The higher number, the more the highway stretches and speeds up.
HyperSpeed 2 is often considered by players to be a good balance of distancing notes and reacting to them on screen.
Invisible Rocker
B→R→R→R→R→Y→B→G
Makes all band members invisible.
"Air Instruments" and "Invisible Rocker" cannot be enabled simultaneously.
Performance Mode
B→R→Y→Y→R→R→Y→Y
Makes the highway and heads-up displays (HUDs) invisible, revealing only the stage.
This cheat makes it harder, in which you will have to guess notes at the right timing by memory and you can't see how well you're doing.
Be cautious when using this cheat.
Star Color
G→R→G→Y→G→B→Y→R
Alters the color of the notes on the highway when Star Power is activated.
Alters the color of Long Star Gems when you whammy Star Power.
