Successfully complete the game. You can continue the game on your cleared saved game file. This will also unlock the "Theater" option, Garden upgrades, as well as an alternate Goh model and the first set of costumes.
Crazy Ninja difficulty
Successfully complete the game under the normal difficulty setting.
Fake death
Press Start to pause game play, then hold L1 + R1 and press Down, Up, Right, Left, Down, Up, Square. A sound will confirm correct code entry. Press the Right and your character will die. You can also do a Mega Jump by pressing X then quickly pressing Right.
Goh's alternate costumes
To unlock a second set of costumes, view all three normal endings or the hidden ending.
Iron stomach
Press Start to pause game play, then hold L1 + L2 and press Up, Down, Up, Down, Left, Right, Square. A sound will confirm correct code entry. All items Goh eats will be edible and will restore health. Alternately, view all three normal endings.
Kinu's alternate costumes
Successfully complete the game under the hard or Crazy Ninja difficulty setting.
Trust in yourself
View all three normal endings.
Very hard difficulty
Successfully complete the game under the hard difficulty setting.
Completion bonuses...