Australia's controversial Internet filter, now in testing, would block all material that has been "refused classification" by the government. Because the highest rating available to video games is MA 15+, any game intended for people over 15 will be blocked.
http://arstechnica.com/tech-policy/news/2009/06/australian-net-filter-to-block-video-games-too.ars
now that sucks , no 18 rated games and most of them are nowdays aren't they.