Speed Racer: The Videogame Cheats
Go to options and select "enter code", then enter the following.
Code: Press B, A, Down, Up, B, A, Down
Difficulty Level 4
After you beat 1&2 go beat the grand prix but you can't get to the grand prix until beat all the championchips in 3 before it. Affter you beat the grand prix you will unlock mirror 4.