Defend the city, kill the boss to secure your town.
Tap anywhere on the screen to throw a shuriken.
You must kill the Ninja Boss before he and his little ninjas destroys your town.
Special feature: Kill every little ninja to boost your "special" bar. When its full, you can release a deadly special attack by pressing the "hit special" button.
You must hit the Ninja Boss as soon as he appears on the screen, before he comes back to attack you.
You get to play all the 21 stages using any of the 3 specials.