All characters:
     At the title screen, press X, Up, B, Down, Y, Left, Start, Right,
R, R, L, R, R, Down, Down, Up, Y, Y, Y, Start, Select.

1 million Studs:
     At  the  title  screen,  press  X, Y, B, B, Y, X, L, L, R, R, Up,
Down, Left, Right, Start, Select.

3 million Studs:
     At  the title screen, press Up, Up, B, Down, Down, X, Left, Left,
Y, L, R, L, R, B, Y, X, Start, Select.

All Extras Unlocked:
     Up,  Down,  L,  R, L, R, L, Left, Right, X, X, Y, Y, B, B, L, Up,
Down, L, R, L, R, Up, Up, Down, START, SELECT