Regarding that:
Most games are either distributed by
JVLAT (Nintendo, Ubisoft, Activision),
CD Distribution (Most third parties, including EA and Sega) or
Solutions2Go (Sony). There are some exceptions, like WB (in Mexico) and Microsoft.
They're released for the region with ESRB ratings, since there is no standard for all the countries, and in some countries they're required to put a "distributed by" label on top of the foil, due to local consumer laws (like Mexico and Peru).
There are some odd exceptions, like that ClassInd FO:NV mentioned before. I remember once having a Fallout 3: GOTY that included two covers in it: One in English and Spanish, with ESRB ratings, and one in Portuguese (Brazil) with a ClassInd rating, so it can be a hodgepodge of standards.
EDIT:
This is the "warranty card" (actually printed on the back of the cover) for the Spider-Man I have.