Tips and trick game

To enter cheats, from the main menu go to Options -> Cheats -> Enter New Cheat. For each code, you have to strum while you press the given buttons. Notes in parenthesis are held together while you strum.
i.e. (RY) denotes Red and Yellow buttons held and strummed once
Also, there are five levels of hyperspeed in GH3. Level 5 is INSANITY to say the least. To switch between them, you press the green button while the code is highlighted after you enter it.
All codes except Unlock All Songs may be turned off directly from the cheat menu by pressing the green button.

Cheat	Effect
OBOYOBOY	Hyperspeed
(GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO) (GR) (GR) (GR) (RY) (RY) (RB) (RB) (YB) (YO) (YO)	Precision Mode
(RY) (RB) (RO) (RB) (RY) (GB) (RY) (RB)	Performance Mode
(YO) (RB) (RO) (GB) (RY) (YO) (RY) (RB) (GY) (GY) (YB) (YB) (YO) (YO) (YB)YR(RY)RYO	Unlock All Songs
(YB) (GY) (GY) (RB) (RB) (RY) (RY) (YB) (GY) (GY) (RB) (RB) (RY) (RY) (GY) (GY) (RY) (RY)	Air Guitar
(GR) B (GR) (GY) B (GY) (RY) O (RY) (GY) Y (GY) (GR)	No Fail (does not work in career mode)
G R G Y G B G O G B G Y G R G GR RY GR YB GR BO GR YB GR RY GR GY	Large Gems
(GR_BO) (GRYB_) (GRY_O) (G_BYO) (GRYB_) (_RYBO) (GRYB_) (G_YBO) (GRYB_) (GRY_O) (GRY_O) (GRYB_) (GRY_O)	Unlock Everything (uses 4-note chords, no sound will play)
(GR) (GY) (YB) (RB) (BO) (YO) (RY) (RB)	Easy Expert (makes the timing window bigger for hitting notes, Cannot be used in single career mode.)

Unlockable	How to Unlock
Tom Morello	Beat the Tom Morello boss battle and buy in unlock shop for $10,000
Slash	Beat the Slash boss battle and buy in unlock shop for $10,000
Lou	Beat the Lou boss battle and buyin unlock shop for $15,000

Unlockables

Open the 'civ4config' file found in your Sid Meire's Civilization IV install directory (Default is 'C:\Documents and Settings\Owner\Application Data\Firaxis Games\Sid Meier's Civilization 4'). Find 'cheatmode = 0' and change it to 'cheatmode = chipotle'. Then during game play open the cheat console by pressing the tilde key '~' and type in any of the following and then press enter. Have either a unit or a city selected and press the following keys to activate the corresponding effect.

Display Debug Menu:
Ctrl + D

Unit Level Up:
(Unit) Ctrl + '+'

World Editor:
Ctrl + W

Increase Gold by 1000:
Ctrl + 4

Add 1 to City Population:
(City) Shift +'+'

Add 10 to City Culture
(City) Ctrl + '+'

Decrease Highlighted Unit's Strength by 0.2
Shift + [

Immediately Complete whatever the City is Producing:
(City) '+'

Increase Highlighted City's Culture by 10:
Ctrl + Plus

Increase highlighted city's population by 1:
Shift + Plus

Increase highlighted unit's strength by 0.2:
Shift + ]

Insert Unit/City
Ctrl + Shift + Left mouse button

Instant Production Completion for Highlighted City:
Plus

Level Up Highlighted Unit:
Ctrl + Plus

Dialogue box to change certain nations Gold and also the Era:
Shift + T

Unlock Hydraulics and Air Bags

These become available for your Gamertag when you join the Rockstar Social Club and complete four of the twelve 'Driving Test' achievements listed on the website. If you already have four of the achievments completed you will unlock hydraulics and air bags just by joining the Rockstar Social Club and linking your Gamertag.

Unlock Karol Garage Partner Mission

 When you reach the 'Idol' rank (33,500 Reputation) this mission will become available.

Custom Items

Customizable items for the diffent classes (Luxury, Tuners, Muscles, Exotics or Superbikes) will become available when you have participated in the indicated number of races.

Skirts: 9 races

Front Bumpers: 9 Races

Rear Bumpers: 18 Races

Car Spoilers: 18 Races

Motorcycle Tails: 18 Races

Car Stereos: 27 Races

Front Seats: 27 Races

Steering Wheels: 27 Races

Motorcycle Tanks: 27 Races

Post Gauges: 27 Races

Taillights: 36 Races

Car Headlights: 36 Races

Motorcycle Bowls: 36 Races

Hoods: 36 Races

Blowers: 45 Races

Exhausts: 45 Races

Intercoolers: 45 Races

Widebody Kits: 45 Races

Vehicle Groups

When you reach the following ranks the indicated vehicle group will become available.

Unlock Group 2:
Get the 'Student Driver' rank (2,000 Reputation).

Unlock Group 3:
Get the 'Racer' rank (8,060 Reputation).

Unlock Group 4:
Get the 'Champion' rank (16,500 Reputation).

Performance Upgrades

When you reach the indicated rank the corresponding Performance Upgrade will become available.

Unlock Level 1 Performance Upgrades for Group 1 Vehicles:
Get the 'Navigator' rank (800 Reputation).

Unlock Level 1 Performance Upgrades for Group 2 Vehicles:
Get the 'Driver' rank (5,600 Reputation).

Unlock Level 1 Performance Upgrades for Group 3 Vehicles:
Get the 'Elite Racer' rank (13,700 Reputation).

Unlock Level 1 Performance Upgrades for Group 4 Vehicles:
Get the 'Savant' rank (22,760 Reputation).

Unlock Level 2 Performance Upgrades for Group 1 Vehicles:
Get the 'Rookie' rank (3,610 Reputation).

Unlock Level 2 Performance Upgrades for Group 2 Vehicles:
Get the 'Veteran' rank (10,760 Reputation).

Unlock Level 2 Performance Upgrades for Group 3 Vehicles:
Get the 'Legend' rank (19,540 Reputation).

Unlock Level 2 Performance Upgrades for Group 4 Vehicles:
Get the 'Hero' rank (26,160 Reputation).

Cheat Mode

To be able to activate the following cheats at the 'Options' menu Collect the indicated number of hidden Rockstar barrels. Remember that when you activate the cheats your progress in Career mode will become disabled.

Unlimited Nitro:
Collect 10 barrels.

Never Damage Out:
Collect 20 barrels.

Unlimited Special Abilities:
Collect 30 barrels.

Top Down View:
Collect 40 barrels.

No Police:
Collect 50 barrels.

No Fines:
Collect 60 barrels.

Unlock Infinite Money

When you complete Career mode this feature will become unlocked.

Unlock Additional Cars

Win the indicated events to unlock the corresponding bonus cars in 'LA Career' mode.

Unlock 2004 Ford SVT Focus:
Win 'Cool Breeze' series race.

Unlock 2004 Ford Cobra Concept:
Win '10 Carat Beatdown' series race.

Unlock 1969 Chevrolet Camara RS SS:
Win 'Bird On The Line' series race.

Unlock 2006 Mitsubishi Lancer Evolution IX:
Win 'Beach Overlook' series race.