Ninja Gaiden II/Unlockables

Costumes

 * Black Jaguar - Complete the game on Path of the Mentor.
 * Camouflage - Complete the game on Path of the Warrior.
 * Dark Blood - Complete the game on Path of the Acolyte.
 * Golden Ninja - Complete the game on Path of the Master Ninja.

Difficulty Settings

 * Path of the Mentor - Complete the game on Path of the Warrior.
 * Path of the Master Ninja - Complete the game on Path of the Mentor.

Game Options

 * Classic Film Filter - Complete the game on any difficulty.
 * Music Test - Complete the game on any difficulty.
 * New Game Plus - Complete the game on any difficulty. Loading a finished game allows you the option of playing a New Game Plus, which starts you off with everything that you accrued during your past game except for quest items.

Gamerpics

 * Gamerpic - Collect all Crystal Skulls
 * Ryu Gamerpic - Complete the game on Path of the Master Ninja.