It's not easy being green, oh hang on, not green, being a ninja. It's all work work work. Hacking, slashing, hacking some more and then finishing it off with another slash or two. But it is the career you've chosen. Every day the same thing, go out, kill someone, come home to the wife and kids, tell them about your day, eat dinner, practice killing things, go to bed and repeat. Who'd have thought being a ninja could become so routine. Maybe you should have opted to be an accountant instead.
This, my friend, is a simple game. You jump around chopping enemy peeps into pieces. If you fail to chop in the correct way, then your enemy will chop you in half. I hope your ability to move your mouse is up to scratch. It will require fast mouse movements matching whatever attack technique required to take out your opponent.
Good luck with the hacking and slashing, I am sure you will do great.
***HUGE GAME (13 MB), WILL TAKE A WHILE TO LOAD, PLEASE BE PATIENT***