Successfully complete the indicated task to unlock the corresponding bonus:
  Black Jaguar costume: Successfully complete the game on the Path Of The Mentor 
  difficulty. 
  Camoflauge Ninja costume: Successfully complete the game on the Path Of The 
  Warrior difficulty. 
  Dark Blood costume: Successfully complete the game on the Acolyte difficulty. 
  Golden Ninja costume: Successfully complete the game on the Path Of The Master 
  Ninja difficulty. 
  Music Test option: Successfully complete the game on any difficulty. 
  Old Film Filter option: Successfully complete the game on any difficulty. 
  Path Of The Master Ninja difficulty: Successfully complete the game on the 
  Path Of The Mentor difficulty. 
  Path Of The Mentor difficulty: Successfully complete the game on the Path Of 
  The Warrior difficulty. 
  Survival Challenge mode: Successfully complete the game on any difficulty.