R

The R rating here is all about the violence. It's not the extreme Tarantino pull-your-eyeballs-out kind of violence, but there's a lot of shooting people and punching people and burning people with electrical weaponry, so there's no shortage of death and injury.

There's also a bit of language, but not a whole lot of drug use (aside from that one pill Neo takes; that's quite the trip). There's also not a whole lot of sex or nudity, although Mouse does make some interesting suggestions about computer-simulated copulation.