FlatOut: Head On

All cars and 1 million credits cheat:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter GIEVEPIX as a code to unlock unlock all cars and get 1 million credits.

1 million credits cheat:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter GIVECASH as a code to receive 1 million credits.

Cheat for all tracks:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter GIVEALL as a code to unlock all tracks.

School bus:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter GIEVCARPLZ as a code to unlock the chool bus.

Big Rig truck:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter RAIDERS as a code to unlock the Big Rig truck.

Big Rig:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter ELPUEBLO as a code to unlock the Big Rig.

Flatmobile car:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter WOTKINS as a code to unlock the Flatmobile car.

Mob car:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter BIGTRUCK as a code to unlock the Mob car.

Rocket car:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter KALJAKOPPA as a code to unlock the Rocket car.

Pimpster car:
Go to "Extras" from the main menu, then select the "Enter Code" option, then
enter RUTTO as a code to unlock the Pimpster car.

Unlockable cars:
Bullet GT: Win the Street Finals in the Grand Finals.
Venom: Win the Derby Finals in the Grand Finals.
Insetta: Win the Race Finals in the Grand Finals.