Various cheats

Enter the codes at the title screen:
Code:                                                 Effect:
I, I, I, L, L, L, I, J, L, J, J, J, W, S, A, D, U, O  Unlock All 
                                                      Mega-Challenges
W, W, I, I, D, D, L, L, S, S, U, O, A, A, J, J, U, O  Pizza One
L, L, J, J, O, O, A, A, U, U                          Pizza Two
S, S, D, L, W, I, A, J, U, U                          Pizza Three
U, U, O, O, U, O, U, O, J, L, I, I                    Super Speed Modifier
W, W, S, S, A, D, A, D, I, J, J, U, O                 Slammageddon
U, O, L, J, O, U, J, L, J, J, J, J, I, I, L, L        Unlock All Characters 
                                                      and Levels
O, U, I, J, S, S, D, A, U, O, J, I, W, S, W, S        Unlock All Medals 
                                                      and Trophies
I, S, J, W, O, A, L, D, S, D, A, W, J, I, L, L        Unlock All Story Mode 
                                                      Chapters