Microsoft pulls its adult content ban from the Windows store guidelines. It previously only allowed up to PEGI16 ESRB rating; anything rated over that was not allowed. Now that the ban has been pulled great titles such as Grand Theft Auto IV can be offered within Metro. This never really mattered anyway, cause anyone who really wants to play a game can just go buy it from a store or from Steam online. This is a smart step from Microsoft, cause titles like these are currently available on the XBox live store, so it only makes sense to allow it in windows store.