User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4517339-20130301132958

There is now an update for Monster Hunter 3 Ultimate that allows US and EU to play together.

And yes that means there will be no more region lock after you download the update ^_^

I for one want to thank "Tigrex" on Facebook for his support. Happy hunting "with" ANYONE!