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Makibishi is an interactive manga/action game with excellent graphics, a cool soundtrack and quirky gameplay: The objective of the game is to hunt down a total of five powerful Ninja who are hiding in different stages and to find hidden treasures along the way. Every time you defeat a Ninja boss, you advance a bit further in the story (which is told using manga-like cut scenes).
The game isn’t huge, but the ideal time-killer for fans of Japanese humor and pop culture (like me). It’s available for $0.99 in the App Store. Developer Makibishi also offers another iPhone app called Ninja Book (iTunes Link, $1.99), and their casual PC browser game “seven” is pretty weird and cool, too (all of their stuff is available in English and Japanese).
Here’s a demo video for Makibishi you should watch before you buy: