Grid Runner

Rock & Roll Racing from Major Bunny
The two player mode to the game may be a little choppy but try this:
Go to Restore Game and enter the password (A,Y,right,X,right,up,down,Y,right,down). Now go to 2-plyer mode and select either Grid Racer world 1,2,or3. You'll have a two car race match similar to Rock & Roll Racing! The spells still work and each lap around the track counts as a "flag". 10 laps wins the race.

Codes from Reuben Wong
Acces the Restore Game option. On this screen, highlight " ENTER PASSWORD" and go into this screen. Enter the follwing codes :
FREE FOR ALL:Up,Y,A,Right,Up,Y,B,Down,Right,Down
GET ALL FLAGS : Down, Y , Right ,A ,Right,Up,Right,B,A,Down
CREDIT HEADS : A ,Y,A,Right,Down,Y,Up,RIght,RIght,A