"The frustrating thing for us is that the standards and rules can be so varied across territories, that we work with five or six ratings agencies and each one has different 'hot buttons'," he told CVG.
But, he added, "I guess that's the way of the world - not every country is the same. You're not aiming at one target, you're aiming at six different ones, worrying about how each one will feel about different things.
"We just go through and make the game that we want to make. We have our eyes wide open, mindful of the things that could be flagged up and how we're going to resolve them if that becomes a problem."
Bethesda’s upcoming Fallout 3 was refused a rating by Australia’s Office of Film and Literature Classification in July due to its portrayal of drug use, but later cleared for release following a number of content edits.