Guitar Hero - Smash Hits - Platform: XBox 360

Cheat mode:
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At the main menu, select "Options", "Cheats", "Enter New Cheat", then enter one 
of the following codes to unlock the corresponding cheat option. If you entered 
the code correctly, a message will appear.

  Always Slide 
  Press Blue, Yellow, Red, Green, Blue, Green(2), Yellow. This mode turns all 
  guitar notes (not chords) into touch pad sliding notes connected by purple 
  lines. It has no effect online. Note: This code prevents achievements from 
  being earned.

  Always Drum Fill 
  Press Green(2), Red (2), Blue(2), Yellow(2).

  Hyperspeed 
  Press Red, Green, Blue, Yellow, Green, Yellow, Red(2).

  Line 6 Effects 
  Press Green, Red, Yellow, Blue, Red, Yellow, Blue, Green to unlock additional 
  Line 6 effects in the Music Studio.

  Invisible Rocker 
  Press Blue, Red(4), Yellow, Blue, Green.

  Air Instruments 
  Press Yellow, Red, Blue, Green, Yellow, Red(3).

  Flame Color 
  Press Yellow, Blue, Red, Green, Yellow, Red, Green, Blue.

  Gem Color 
  Press Red(3), Blue(3), Yellow, Green.

  Star Color 
  Press Green, Red, Green, Yellow, Green, Blue, Yellow, Red.

  Vocal Fireball 
  Press Green, Blue, Red(2), Yellow(2), Blue(2).