A corageous ninji which will fight Mario bravely, dissapearing under a puff of smoke every time it touches the floor, only to be teleported and ready to attack again. It has multipe attacking options: dropping just above Mario, attacking him with a hammer and jumping towards him.
It's pretty customisable; for that, check the .asm file.
-Optimised a bit the code. -Now the ninji can't be killed with a cape or a fireball when invisible.
The bug fix is appreciated, but the sprite now doesn't insert (because there are no indexed TRB/TSB instructions). Resubmit it using LDA : AND/ORA : STA and it will be accepted.