This app was removed from the App Store.
iOS Universal Games
If you’re a fan of the action-adventure genre, or if you want a fun game with a bit of old-school charm, you’ll probably dig Ninja Gaiga. -TouchArcade
Ninja Gaiga is an open world type of action adventure game. You control a ninja to fight through different levels and bosses in order to seal Dark Lord's power back into Soul Stone. There is no in app purchase. You will get power up, equipments and skills in the game. Everything is base on gaming skill.
-Boots and Scrolls Items
TouchArcade —'Ninja Gaiga' Review - Being a Ninja Isn't Always Pretty Work