You can use your environment against your enemies, learn new skills and improve on old ones. You can have missions or follow your own paths accordingly, there are no limitations to a ninja aside from the player... (And some things you just can't do with BYOND)
Currently I wish to reveal a little glimpse of my ability to hide in plain sight. You can sneak up on people in a chameleon-like state, in which you assume the color of your surrounding, or you can rush at them full bore... It's your choice.
Here is me hiding in plain site, with no camo.
Can you find me? If not look again below.
Deadly assassin I am!
Well, look out for it. This game may sneak up on you before you know what happened.