Unlike the standard edition, the GOTY version (sometimes labeled as "Classics" in certain regions) provides the "complete" Ezio Auditore experience on one disc:
In the context of the Xbox 360 homebrew and modification scene, these terms define how the game files are stored and executed: Assassins Creed II GOTY ISO & XEX – XBOX 360 [R...
: Adds new missions involving Caterina Sforza. Unlike the standard edition, the GOTY version (sometimes