
First, restart your game by going to the Runaway Shop and set the difficulty to "Hell's Finest." Play the Moab Fortress until you reach the boss. At the boss battle, leave your PSP on. You'll lose about 500 lives per hour!
When you stun Laharl, don't attack him! Since he is a Prinny, you can pick him up and throw him and he will die instantly.
Stun Chefbot and attack him. When the stars above his head fade, start hip-pounding the flaming keyhole. His shield counters should fade.
Hold the L button and R button and press X and Prinny will detonate. You will reset to your last save (useful for aborting boss fights gone wrong).
Die 1,000 times and begin a New Game+ to unlock the Prinny Raid Skill.
Collect 70 Lucky to unlock the Cave of Ordeals.
Collect all of the Torn Letters to unlock Asagi Mode.
At the title screen, enter the following code while highlighting "New Game" to start a new game with an alternate storyline: Triangle, Square, Circle, Triangle, Square, Circle, X
To unlock different endings, perform the actions listed below:
Collect 100 Lucky and choose the third option at the castle door to fight Etna.