Before its merger with Enix, Square was noted for making Super Mario RPG: Legend of the Seven Stars in collaboration with Nintendo.
Square Enix also made Mario Hoops 3-on-3 and Itadaki Street DS for the Nintendo DS with the latter exclusive to Japan. Both of these DS games are crossovers between the Mario franchise and one of Square Enix's franchises (Final Fantasy in the former's case, and Dragon Quest in the latter's case). Another of the company's creations is Mario Sports Mix, the first Mario spin-off from the company to be made for the Wii. The game includes the same Final Fantasy characters who appear in Mario Hoops 3-on-3, as well as Slime, one of the Dragon Quest characters who appears in Itadaki Street DS. The company logo appears in Mario Hoops 3-on-3, where it can be seen on two courts: Mario Stadium and Peach Field. Square Enix also developed another Dragon Quest-Mario crossover game called Fortune Street, a sequel to Itadaki Street DS.
Square Enix is also one of the third-party companies represented by playable characters in Super Smash Bros. for Nintendo 3DS / Wii U, with Cloud Strife, the hero of Final Fantasy VII, available as a downloadable fighter. Also, a stage based on a location from Final Fantasy VII; Midgar, is available. In addition, accessories for Mii Fighters based on Geno (a character from Super Mario RPG: Legend of the Seven Stars owned by Square Enix) and Chocobo (a species from the Final Fantasy series) are available for purchase. The second Final Fantasy fighter, Sephiroth, makes his debut as a DLC character in Super Smash Bros. Ultimate, and Cloud and Midgar also appear as returning stages. In addition, Super Smash Bros. Ultimate's Challenger Pack 2 downloadable content features elements from the Dragon Quest series, including the fighter Hero and the stage Yggdrasil's Altar. Mii Fighter items based on characters from the Dragon Quest series are also available as DLC in Super Smash Bros. Ultimate.