Well it took until only a few days before the release of the film for Australia's Rating System (OFLC) to rate the film, and it's odd but not surprising that it received a very high rating. The film was rated MA 15+, which is the second highest rating possible for a film in Australia.

The odd part about the high rating is that the US rated the film PG-13, which is equal to an M in Australia. It's no oddity for the OFLC to rate media higher than it should be, but they are usually not very hard on films. Could it be the fact it was based on a game? Entirely possible, but a little far fetched.

It doesn't make sense that a film rated PG-13 in the US (meaning it requires Parental Guidance) could be rated MA in Australia which would make it Restricted to Mature Audiences. At this rating it is in the same league as films such as the Saw movies, and many other horror movies. Things just don't add up, it is possible that Australia is going to receive the unedited version of the film that the US originally had rated R? Or has the OFLC just over-rated something again? Guess we'll just have to wait and see...

Source: OFLC Website