Achieve a team goal to unlock the Hoshipon Shop.
Successfully complete the Cave Of Valour to unlock the Meden Mart.
Successfully complete the game to be presented with three options for unlockables. Option 1 is Dark Uber Heroes playable in VS mode, Option 2 is Extra Labyrinth in Multi mode, and Option 3 is unfreeze Priestess.
Unlock all three endings. Then, any music purchased from Hoshipon's shop will be played instead of the normal background music when selected.
Stop to "Party" to fill your fever bar faster than walking, attacking, or defending. Note: This is helpful before a Boss fight.