See the Credits:
To view the credits, enter your name as "HEINEY" in the Championship Mode name screen.

Unlock All Cars:
To unlock all the cars in the game, enter your name as "ACO" at the Championship Mode name screen.

Unlock All Championships:
To unlock all championships, enter your name as "NUMBAT" in the Championship Mode name screen.

Unlock All Tracks:
To unlock all tracks, enter your name as "SPEEDY" at the Championship Mode name screen.

Unlock Le Mans:
To unlock the Le Mans, enter your name as "WOMBAT" in the Championship Mode name screen.