Xero on 26 May 2010
It's region locked. The US blog is full of complaints about it.
If you live in AU, you can only play with AU, if you live in NA, you can only play with NA, if you live in EU, you can only play with EU. As far as I know. I tried using a US account and this doesn't let me play with US players. I think I'd need a US copy of the game, and a US proxy.
http://i605.photobucket.com/albums/tt140/GSkorchie/Modnation%20Racers/regionlock1.jpg
Image from us blog for proof if you likes.
If you care about the game, go complain on the US blog. A fair few people have, apparently it's the only way they're going to listen.
