Mini Ninjas Cheats

Xbox Live Gamer Picture
You can unlock a Futo Gamer Pic by getting the 'Stop! Futo Time!' Achievement (Use Futo in combat on all levels).

Messing With Their Heads -Mini Ninjas
The samuri are pretty stupid and really weird. It has nothing to do with this hint, but here's some dialogue I can picture them saying to one another:

*Hiro rushes past a pair of samuri while using the Spirit Form spell to control a fox.*
Samuri 1: Ooo, a fox! Catch it, catch it! Master will be most pleased!
*Hiro-Fox gets away, and Hiro uses the Camoflage spell to look like a bush so he can sneak up on them.*
Samuri 1: Awww, the fox got away... Well, at least-
Samuri 2: Hey, hang on a sec, I think that bush just moved!
Samuri 1: Really? Cool, I bet it was a rare Walking Bush! You're really lucky to have seen one, they're supposed to bring good luck!
*Hiro uses the Spirit Form spell to posess Samuri 2.*
Hiro: Oh, they bring good luck? It's a shame you didn't see one, then.
*Hiro destroys Samuri 1, who turns back into the chicken he was to begin with and wanders off.*

Sorry, just had to put that in there.
Anyway, once you reach the level cap (on the Xbox 360 version, at least) you can use the Spirit Form spell to control the small samuri. It doesn't matter what kind of little samuri you take control of, they all wind up as the blue, sword-wielding ones.

The samuri never seem to notice that the one you took over is acting differently now, so feel free to pick them off whenever you're ready, but be careful. Some do notice, and they tend to figure it out pretty quickly, but once you attack one, even if no one realizes it's not a samuri, they all start attacking you. Also, if even one figures it out, they all start attacking you.

Once you release the samuri from the spell, it turns back into an animal, like it would if you defeated it.

Good luck, have fun, hope you enjoy messing with the samuri's heads!

Easy killing against large numbers near grass
When enemies are wondering around near grass ALWAYS sneak up on the best enemy and kill him then stun a few enemies and kill the ones that arn't stunned then kill the ones who have just been stunned.