Have you heard of "Sega Saturn de Hakken!! Tamagotch Park" ? Probably not, as it was a Japan Only release game. In it, you could raise various Tamagotchi type creatures / pets, but in color instead of on some LCD screen or small item. But, because Sega had a hand in making it, you could also raise a Sonic! Or something that looks exactly like him...as seen here with this screen. This was called the Sonictchi.