Common Sense Note
Parents need to know that this mature movie is a meditation on the nature of heroism, the purpose of violence, and what it takes to live in peace. So if you go expecting Jackie Chan, your kids will be mystified. Kids younger than 12 are going to find the circular nature of the narrative very confusing since the story is told four different times in four different versions. Also, unlike Crouching Tiger, there's a lot of talking in the movie, which means a lot of subtitles. Unless you want someone tugging on your arm saying "What did he say?" we suggest teens and up age wise. There's one naked tush in the beginning, and a woman has her clothes ripped off in a lovemaking scene but otherwise, the only concern is the swordplay and the occasional blood.
One bare bottom; a mistress has her robe torn open (non-explicitly) and there is consentual sex -- seen only as writhing shapes under sheets. Talk of a one-night stand and what is more or less adultery.
Characters (including innocent civilians) killed in showers of arrows. Principle characters die in swordfights and stabbings, with only some bloodshed (some combatants are simply slapped and tapped with the flat sides of the weapons instead -- this tends to be an insult). One double suicide by sword.
Morally complex idea of being a "hero" -- not just a superhero defeating powerful enemies but one with a secret agenda who is willing to change his mission and die for a superior cause (and possibly be misperceived as a traitor). Sub-themes about the deceptive nature of "truth"; destructiveness of jealousy and revenge; need to put aside regional differences to unify as one vast, more powerful union -- even if it means submitting to conquest by a tyrant.
Drugs / Tobacco /
The main character is invited to "drink" with the King.