State politicians have attacked the move to introduce an adults-only classification for video games, saying the move will expand moral boundaries and make it difficult to monitor games children play.

Game fans have been lobbying for an R18+ rating for several years, arguing it would allow for more mature themes in games and ensure fewer adult games were given MA15+ ratings.

Left 4 Dead.

At the Standing Committee of Attorneys-General meeting in Adelaide on Friday, all states and territories, except NSW, gave in-principle support for the classification change.