For the longest time games like Left 4 Dead 2 have had to be edited or not be allowed at all in the country of Australia. The country of Australia has been a bit strange when it comes to allowing mature games to be released; they didn't allow Left 4 Dead 2 to get released because it was too mature and was not given a rating, so Valve edited it and took out the gore and things.
However, it seems that is all going to change with the 18+ rating. Finally, people in Australia will be able to play the games that most people are already allowed to play in the world.
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