Valve is "exploring options" for resubmitting Left 4 Dead 2 for classification in Australia, where it was released as a censored version in 2009.
The move follows the introduction of an R18+ rating in Australia on January 1, which may accommodate titles not suitable for an MA15+ rating.
Posting on the Steam forums, Valve's Chet Faliszek said the company was on the case. "We have been exploring the options here and what we can legally do.
"We will have more information on this when we understand the issues fully and how we are moving forward, but don't worry, any cost associated with it doesn't worry us, this is something we want to do."
The news follows Warner Bros. submission for Mortal Kombat: Komplete Edition in Australia, following the original edition's ban upon release in 2011. Under the new guidelines - and with the new classification - it's possible that previously banned titles will be acceptable.
Ninja Gaiden 3: Razor's Edge was the first game to be rated R18+ in Australia.