Video gamers pushing for a R 18+ classification have received a powerful ally in the federal government, which has announced it supports the move.

But a deal could still be stymied if any one of the states and territories decide to oppose it.

Fallout 3 was banned from sale in Australia until it was modified to remove objectionable content.

The federal government announced on Sunday it will push for the change in order to provide better protection for kids and teenagers.

Australia's most restrictive classification for video games is currently MA 15+ and those classified as R 18+ overseas are often banned.