Go to the options screen and enter L1 + L2 + R1 + R2 then hit Square, Triangle, Left, Right and Up. You'll hear a sound, now go and rack up those points!!
At the options menu do the following: L1 + L2 + R1 + R2 and press Square, Triangle, Left, Right, Up. You should hear a sound, do the code again to turn it off.
Cheat Mode (Correct Code)
Do the same as above, hold all the top buttons and press X seven times, and then press Square. You should hear a sound.
Hold, L1 + L2 + R1 + R2 and press X four times, and Triangle four times. If you want to use regular boards, then do the code again.
At the options menu hold L1+L2+R2+R1 and hit Cirlce seven times, then Square. You should hear a sound.
Running Man Code
At the options menu, hold L1+L2+R1+R2 and hit Square- Triangle- Circle- X- Square- Triangle- Circle- and X. You should hear a sound.