Australia may finally have an adults-only game rating, but that doesn't mean anything and everything is approved for consumption down under. Take the upcoming South Park game, for example, whose alien anal probe scene has had to be heavily censored for Australian release.
Seems alien anal probes are a sore point for Australian censors; Saints Row IV ran into similar problems upon release.
South park: Stick Of Truth's issues are a little more complicated, though, as Player Attack point out. According to ratings documents the site has shared, the Australian Classification Board took exception to the fact that the game's anal probe scene features a kid, has probes that "visually resemble penises" (as you can see above) and are interactive.
After a number of attempts to modify the scene failed to get it cleared for release, even with an adults-only rating, developers Obsidian did a very Matt-Stone-and-Trey-Parker thing.
In the Australian edition of the game, the interactive scene is now entirely gone. It's been replaced by text descriptions of the action, including "aliens forcibly probe your rectum with a dildo-shaped probe", "probe his ass with violent force" and "causing his anal probe to penetrate him over and over".
Oh, and while the text is showing, there's an image of a crying Koala.
South Park: The Stick of Truth – the offensive bits [Player Attack]