Development of "Sonic 2" began in November 1991, two months later than Cerny had intended, as Sega of America initially felt it was too soon for a sequel. STI handled development; both American and Japanese staff contributed, although, according to team member Tim Skelly, "Everyone attached to "Sonic 2" ultimately worked for Yuji Naka. I think Naka would have been much happier if he was working with an all-Japanese team, but just because of the language barrier and some cultural differences."