Start a New Game with the Alternate Storyline
The Alternate Storyline is normally unlocked by collecting various letters throughout the game, but it can also be unlocked by entering the following code at the title screen, with the pointer on "New Game." There will be a voice confirmation if successful.
Effect Code Unlocks Alternate Storyline (JP) Triangle, Square, X, Triangle, Square, X, Circle Unlocks alternate storyline (US) Triangle, Square, Circle, Triangle, Square, Circle, X
Here is how to unlock the different endings.
Unlockable How to Unlock A News of Explosion Penguin Lose all 1000 lives Asagi Ending Beat her game in her story mode Normal Ending Beat the game normally The Escape of the Prinny Talk to the Ninja and pick the first option
Unlockable How to Unlock Asagi mode Collect all Torn Letters
Contributed By: kbgan.
Unlockable How to Unlock Cave of Ordeals Collected 70 Lucky
Unlockable How to Unlock Prinny Raid Skill Die 1000 times and start a newgame+
Contributed By: 5hadows.
To fight Etna you must collect 100 Lucky then choose the 3rd option in the castle door to fight her.
Hold L+R, then press X. You Prinny will explode, and then you'll start from the last save point. Very useful when you want to restart a boss fight quickly.
Contributed By: Seraphman.
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More Prinny: Can I Really Be the Hero? from GameSpot