Complete the following goals in each level to unlock the corresponding bonuses:

Scenario 1
Get into the top three at the beginning to unlock the Supottore-Su car (single player), Calsonic Primeraitc car (two player), R390GT1 car (time attack), and the Asia and Italy races.

Scenario 3
Get into top three in scenario 2 at the end to unlock five new cars in single player, two player, and time attack modes, and the Pacific and Japan races.

Scenario 4
Get first pace in scenario 3 to unlock five new cars in single player, two player, and time attack modes.

Scenario 5
Set the number of laps to 20 in scenario 4. Then finish in third at the end to unlock eight cars.

Scenario 6
Set the number of laps to 20 in scenario 5. Then finish in first at the end to unlock the GTP-ZxTurbo car and all the cars in scenarios 1 through 5.

Scenario 7
Set the number of laps to "Full". Then finish in first at the end to unlock an extra difficulty level.