Using all your skills as a ninja, and armed only with a gun and a grappling hook, traverse 50 challenging colour coded levels.
When you think of ninja games, N comes to mind. Other than that, it's pretty dry out there for games featuring the stealthy black clad warrior of the night. Fortunately for you - this is a ninja game. Even better, it's really, really good.
There's no story, but if you need one, think of it sort of like a ninja training academy. There are fifty levels (some ridiculously easy, while others are seemingly impossible) and all can be scaled, slung across or bullet propelled your way through.
Before every level, a green and red indicator shows you what you've got to work with. Either its walking and jumping, sling shooting or a gun. Sometimes its two, sometimes all three. To complete each level you have to use ingenuity, a little bit of lateral thinking, a lot of physic motion and a fair amount of luck.
Knowing the difference between specific colours is helpful here, as our ninja cannot move onto other-coloured pieces. For example if he is red, he can't touch blue floors. If he's green, he can't touch red, etc. etc. but there are a lot of colour variations in the game. One level for me turned out to be a lengthy process of trial and error, in stead of arcadey fun.
The game is tight, on the whole, and incredibly fun. Package fifty levels with an insanely easy to use level editor (it's even easier than Jetpack's level editor) and you'll be on your way to the ninja appreciation academy before you know it.