Voodoo Extreme put up a quick piece on possible legal troubles HL2 may face in Australia. "In Australia, no games have been accepted if they fit into the R(18+) category, so this means HL2 needs to fit into at most the highest category of MA(15+), or it will be refused classification."
I have yet to see any problem, however complicated, which, when
you looked at it in the right way, did not become still more complicated.
-- Poul Anderson