Shinobido: Way of the Ninja, aka Shinobido Imashime, depends on which version you get.
It is truly the same gameplay as in way of the samurai, except it is a ninja game: You have three lords that are going to war and want your services. And depending on which you favor the most, the balance of power moves to one side or another. One part that truly caught me is when one lord gives you the mission to deliver a weapon design, and if you refuse another lord asks you to steal the same weapon design for him. You start with the basics (rob or protect items, kill all enemies or assasinate someone) but you can climb to get more respect and they will ask you to rub out the other lord's generals, or the lord him/herself.
Has also around the same stealth system of instant kills as in Tenchu games, adding a cool item handling. You find herbs or mushrooms that have different powerups, good or bad (or course, you can trick enemies to eat the bad ones) and even has the ability to mix them together to form a different powerup.
Last but not least, it has... YES! A scenario maker tool, so when you get through the story you can start making your own!
A must to all ninja lovers!