¿Viva Piñata?

I find it ironic that Viva Piñata, the new Microsoft kids game, is available in many international languages and regions ... but doesn't list Mexico! No, they list "United States", "Canada - English", "Canada - French", and "Spain". But NO MEXICO. Considering "piñata" is kinda part of the Latino culture (and even Horstacio made an appearance in Six Flags Mexico), wouldn't you think it obvious that Mexico should have been included? I must be missing something here...