AN adults-only computer game rating category will at last become a reality with legislation passing Federal Parliament.

The new law fulfils the Commonwealth's part of a deal with states and territories to include an R18+ rating in the games classification system.

"These are important reforms over 10 years in the making," Home Affairs Minister Jason Clare said.

"The R18+ category will inform consumers, parents and retailers about which games are not suitable for minors to play and will prevent minors from purchasing unsuitable material.

"The reforms also mean that adults are able to choose what games they play within the bounds of the law."

Previously, the highest rating for computer games has been MA15+ meaning overseas adult-only games are usually banned here or given a lower classification allowing children to obtain them.

The new laws bring computer games in line with the classification system for films and other material and make Australia more consistent with international standards.

They have received overwhelming support during years of consultation - one discussion paper received more than 58,000 submissions with most in favour.