The Federal Government is pushing the states to give in-principle support to an R18+ classification for computer and video games.

Federal and state attorneys-general will discuss the issue today when they meet in Canberra.

Home Affairs Minister Brendan O'Connor says the new rating system would protect children by restricting some games to adults.

"There are persuasive and compelling arguments to have an R18+ classification level for video games, and I do believe if people come to the table with an open mind we'll reach agreement on this proposition," he said.

Christian groups argue the move would open the door to more violent games.

But Mr O'Connor says some games currently rated MA15+ could be restricted to adults under the new system.

"This will provide better parental guidance, better protection for children," he said.

Victorian attorney-general Robert Clark says he will scrutinise the Government's case carefully.

His West Australian counterpart, Christian Porter, says he will consult with cabinet before making a final decision.

The ACT Government is throwing its support behind the new rating system.

"We think that computer games should have the same range of classification that films do, that printed publications do, and indeed television programs do here in Australia," said ACT Attorney-General Simon Corbell.

"That's based on the principle that adults should be able to see, to view, to read what they wish as long as it does not do harm to others."

Mr Corbell says the changes would provide better protection for children.

"That refused classification process has created a black market for these types of games or created a situation where potentially violent material has crept into other categories such as MA15+," he said.

Northern Territory Chief Minister Paul Henderson says he is open to change in the classification system.

"There needs to be a public debate on this," he said.

"We don't want kids having access to violent games that are going to the detriment of their wellbeing.

"So we certainly welcome the debate to see what the Commonwealth has to put on the table.

"But ultimately classifications are a Commonwealth issue."