All Tracks and Cars
Go to the main menu and press X X, SQUARE SQUARE ,TRIANGLE TRIANGLE, O O The sound of a car's engine reving will confirm the code worked. Go to a single race annd you should have all cars and tracks. After you go to single race you can have all cars and tracks in all Modes
Submitted by Ross Bishop and Paul Chereton
Mega Cheat
To gain everything. At the main menu press X,X,Sq,Sq,Tr,Tr,O,O.
Submitted by matthew hillier
Tips/Hints
Back of the Pack
Much like Destruction Derby, the only way to win the Demolition Circuit is to hang back in the pack and hammer away at the other cars for maxinum points then making a break to front on the last lap.