Final gallery items: Unlock all gallery items except for the final five.
Then, enter the gallery menu and press Up(2), Down(2),
Left, Right, Left, Right, X.
The game will exit the gallery menu. Press Circle to enter
the menu again. The sound of a coin will confirm correct code
entry.
Resort songs: Press Start at the song selection screens to
sort them in various orders. Press Start repeatedly to
cycle through the sort types.