None.

There are some intense battle scenes show a little bit of blood. Also, being a movie about ninja, the film is loaded with martial arts fights.

A man in burned to death.

The main villian tortures his prisoners by beating them with a whip.

A ninja is stabbed in the neck with an arrow.

After having a martial arts duel, one ninja kills the other with a grenade.

In the climax, the hero and the main villian have a hand-to-hand combat fight and the hero brutally beats him to death. Blood is seen flowing from his mouth.

Mild language and one f-word.

None.

Some brutal torture scenes and images of bloodied corpses.