Square Enix

Square Enix, formerly known as Squaresoft, is a video game-making company who once worked for Nintendo and made Super Mario RPG: Legend of the Seven Stars; however, they have since switched to work for Sony. They have recently, however, made Mario Hoops 3 on 3 for the Nintendo DS; and made Itadaki Street DS, another game for the DS. Interestingly, both of these DS games are crossovers between the Mario series and one of Square's franchises (Final Fantasy in the former's case, and Dragon Quest in the latter).