Sega has told Polygon that Sonic Boom is being made in the west as the company wanted to have a completely Westernized branch for the Sonic franchise. Sonic game designer Takashi Iizuka said that Sega wanted to develop a Sonic game for Western audiences primarily, which is why they chose to have Big Red Button develop the Wii U version of Sonic Boom and have Sanzaru Games work on the Nintendo 3DS title.
“As part of completely thinking about the West, we wanted to make sure we had Western game developers and make it a part of Western television. We wanted to make sure it was developed best for Western audiences primarily; this was very important.
“The whole thing started with the television series. Our previous series, Sonic X, was made in Japan and influenced by Japanese anime; the main audience it was made for was in Japan, although it came to the West as well. So Sonic Boom is something made specifically for the Western audience. For the TV series to be successful, we pretty much had to make it for that audience, and the games tie into that strategy.”