The longer you play Rakuga Kids, the more options will be unlocked that you can manipulate.

• After 10 hours (total game time): Stun Rate
• After 15 hours: Magic Limit
• After 20 hours: Combo Limit (on/off)
• After 25 hours: Magic Free (on/off)
• After 30 hours: No damage (on/off)

To get these options the easy way, just leave your console on overnight. Note that you can save your total game time by manually selecting Option/System Data.

If you've logged more than two hours of total game time, go to the Character select screen an press L while selecting Mamezo. You will now be able to play as Inuzo.

After five hours of total gameplay time, the hidden character Darkness will be available in the Character Select section.