NES Ninja Gaiden:
Turn in all 50 scarabs at the item shop to unlock the old skool Ninja Gaiden (NES) for play at Han's Bar.
Arcade Ninja Gaiden:
Complete the game under any difficulty setting.
Ninja Dog Difficulty:
Die three times in a row in Chapter 1. Answer "Yes" when asked "Do you really give up the way of Shinobi?".
Hard Difficulty:
Have a completed Ninja Gaiden saved game on your hard drive. Or, complete the game on Ninja Dog or normal difficulty.
Very Hard Difficulty:
Have a completed Ninja Gaiden: Hurricane Pack 2 saved game on your hard drive. Or, complete the game on hard difficulty.
Master Ninja Difficulty:
Complete the game on Very Hard difficulty setting.
Costumes!
Beat these missions/modes for alternate costumes:
| Ninja Dog or Normal difficulty |
Comic |
| "Special" mission |
Dead Or Alive |
| Hard difficulty |
Red Muffler |
| Very Hard difficulty |
Ryuken |
In Hard mode, turn in the indicated amount of scarabs to unlock the following items.
| 1 Scarab |
Technique Scroll - Counter Attacks |
| 5 Scarabs |
Technique Scroll - Izuna Drop |
| 10 Scarabs |
Technique Scroll - Guillotine Throw |
| 15 Scarabs |
Windmill Shuriken |
| 20 Scarabs |
Wooden Sword |
| 25 Scarabs |
Dabilahro |
| 30 Scarabs |
Armlet of Celerity |
| 35 Scarabs |
Spear Gun |
| 40 Scarabs |
Armlet of Benediction |
| 45 Scarabs |
Armlet of Fortune |
| 49 Scarabs |
Plasma Saber Mk. II |
| 50 Scarabs |
Dark Dragon Blade |
| 20 Scarabs |
Wooden Sword |
In Ninja Dog mode, turn in the indicated amount of scarabs to unlock the following items.
| 1 Scarab |
Life Of The Gods |
| 5 Scarabs |
Armlet Of Potency |
| 10 Scarabs |
Life Of A Thousand Gods |
| 15 Scarabs |
Spirit Of The Devils |
| 20 Scarabs |
Dabilahro |
| 25 Scarabs |
Armlet Of Celerity |
| 30 Scarabs |
Armlet Of Benediction |
| 35 Scarabs |
Great Sprit Elixer |
| 40 Scarabs |
Armlet Of Fortune |
| 45 Scarabs |
Jewel of The Demon Seal |
| 50 Scarabs |
Arcade Ninja Gaiden |
In Ninja Dog mode, turn in the indicated amount of scarabs to unlock the following items.
| 1 Scarab |
Life Of The Gods |
| 5 Scarabs |
Armlet Of Potency |
| 10 Scarabs |
Life Of A Thousand Gods |
| 15 Scarabs |
Spirit Of The Devils |
| 20 Scarabs |
Dabilahro |
| 25 Scarabs |
Armlet Of Celerity |
| 30 Scarabs |
Armlet Of Benediction |
| 35 Scarabs |
Great Sprit Elixer |
| 40 Scarabs |
Armlet Of Fortune |
| 45 Scarabs |
Jewel of The Demon Seal |
| 50 Scarabs |
Arcade Ninja Gaiden |
