While absolutely definitive proof that PSPs games are open for games of all regions to play will have to wait until US-edition PSP systems are available, we can finally confirm that US games play just fine on Japanese PSPs. We received our first retail copy of a US game -- EA's Need For Speed Underground: Rivals, which we will have further coverage of next week -- and found that it played just fine on the PSP we picked up months ago in Akihabara, Japan. Aside from having to know that Japanese game systems use the circle button to make menu choices instead of the westernized X (which was no longer an issue once we were in the game, as it's only global menus that have this import quirk)