Ninja Gaiden 3 Razorís Edge Cheats for Wii U
You can unlock everything there is in Ninja Gaiden 3: Razor's Edge, but it requires a lot of work. All the weaponry and Ninpo unlock by collecting Karma and through progressing in the Story mode. You can also upgrade most moves using Karma Points.
Health improvements require collecting the Scarabs that you find throughout the game's levels, then spending your Karma on the upgrade. You can unlock Costume 2 through playing the Story (and buying with Karma). Costume 3 is unlocked having collected all 50 Scarabs in the game. Costume 4 is unlocked when you have attempted 10 challenges. Be prepared to play through the game multiple times to get all the Karma you need.
Complete the following tasks to unlock the corresponding alternate costume.
Momiji's 3rd Costume:
Complete 25 Ninja Trials with Momiji.
Momiji's 4th Costume:
Complete 50 Ninja Trials total with Momiji.
Ryu and Ayane's 3rd Costumes:
Collect ALL 50 Scarabs.
Ryu and Ayane's 4th Costumes:
Collect ALL 10 Crystal Skulls (available under Normal or higher difficulties).