Ninja Gaiden

Armlet of Benediction
Give 15 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Armlet of Fortune
Give 30 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Armlet of Tranquillity
Give 40 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Breathe Underwater
Approach a large body of water and just as you hit it, tap A to run on the water. Keep running until you hit a wall and start sinking slowly. Eventually you will hit the bottom and if you keep running you will be able to breathe underwater.
(Thanks to kimsue3@wk.net)

Dabilahro:
Give 20 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Dark Dragon Blade
Beat the game on any difficulty. Play again and visit Muramasa's shop in chapter 13.
(Thanks to kimsue3@wk.net)

Evil Ryu
Beat the game on the Very Hard difficulty.
(Thanks to kimsue3@wk.net)

Hurricane Pack Scarab Rewards
Exchanging scarabs for rewards in the Hurricane Pack will give you different items:
Armlet of Benediction: 35 scarabs
Armlet of Fortune: 10 scarabs
Armlet of the Moon: 20 scarabs
Armlet of the Sun: 30 scarabs
Armlet of Tranquillity: 45 scarabs
Dabilahro: 25 scarabs
Dark Dragon Blade: 50 scarabs
Jewel of Demon Seal: 40 scarabs
Vigoorian Flail: 15 scarabs
Wooden Sword: 5 scarabs
(Thanks to kimsue3@wk.net)

Kitetsu
Defeat Doku at the end of Chapter 11. This sword will take health away slowly.
(Thanks to kimsue3@wk.net)

Life of the Gods
Give one scarab to Masamura.
(Thanks to kimsue3@wk.net)

Movie Gallery
Complete the game on normal or hard difficulty.
(Thanks to kimsue3@wk.net)

Ninja Gaiden 1
Give 50 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Ninja Gaiden 2
Obtain Ninja Gaiden 1, then shoot the clock face in Tairon near Muramasa's shop.
(Thanks to kimsue3@wk.net)

Ninja Gaiden 3
Go to the peristyle passage in the Aquaducts, triangle jump back up to where you got the golden scarab on the top of the broken pillar.
(Thanks to kimsue3@wk.net)

Ninja of the Future Outfit
Complete the game on normal or hard difficulty, then hold L and begin a new game.
(Thanks to kimsue3@wk.net)

Plasma Sabre
Complete the game on normal difficulty.
(Thanks to kimsue3@wk.net)

Play Japanese Versions of Classic Ninja Gaiden Games
Put the Text and Subtitles to Japanese from the Options menu, and you can play the Japanese versions of the first 3 classic Ninja Gaiden games "Ninja Ryukenden".
(Thanks to kimsue3@wk.net)

Play Ninja Gaiden 1 from the Main Menu
Beat the game with Ninja Gaiden 1 in your inventory.
(Thanks to kimsue3@wk.net)

Play Ninja Gaiden 2 from the Main Menu
Beat the game with Ninja Gaiden 2 in your inventory.
(Thanks to kimsue3@wk.net)

Play Ninja Gaiden 3 from the Main Menu
Beat the game with Ninja Gaiden 3 in your inventory.
(Thanks to kimsue3@wk.net)

Skip to Final Boss on Level 16
On level 16, get to the boss, and lose to him. Now, continue, and get to the Dark Dragon Blade. During the cut-scene when you get it, press start, and the cut-scene where you go to the final boss will play.
(Thanks to kimsue3@wk.net)

Sprit of the Devils
Give 10 scarabs to Masamura.
(Thanks to kimsue3@wk.net)

Unlabored Flawlessness
Purchase the Wooden Sword, then Upgrade the sword to its Maximum Level.
(Thanks to kimsue3@wk.net)

Unlock all Music in Sound Test
Finish the game once on Normal / Hard.
(Thanks to kimsue3@wk.net)

Very Hard Difficulty
Complete the game on normal or hard difficulty.
(Thanks to kimsue3@wk.net)

Windmill Throwing Star
Down the street from Han's Bar, in a narrow alleyway, you'll have to use the narrow blue-striped area to venture into the back corner to find the item.
(Thanks to kimsue3@wk.net)