Ubisoft

 (formally Ubi Soft Entertainment Software) is a video game company headquartered in,. Founded by Christian, Claude, Gérard, Michel, and Yves Guillemot, they have developed games from acclaimed franchises, including ', ', ', and '.

Mario + Rabbids series
Ubisoft has published the Mario and  crossover game Mario + Rabbids Kingdom Battle outside Japan, and the game has been developed by its Milan and Paris studios. Within Japan, it is published by Nintendo. The game would go on to be a huge success, becoming one of the best-selling third party games on the Nintendo Switch. This would then lead to a sequel called Mario + Rabbids Sparks of Hope to be developed and published by Ubisoft, scheduled to release in 2022.

Other games
Trophies of, , and Barbara from the Rayman series are present in Super Smash Bros. for Wii U, and costumes for the former two characters, based on Mario and Luigi respectively, can be obtained in the Wii U version of  and its Nintendo Switch port Rayman Legends Definitive Edition. Rayman, Rabbid Mario, Rabbid Peach, and Rabbid Kong appear in Super Smash Bros. Ultimate as spirits.

The Wii version of  features an exclusive track named "Just Mario" with the artist credited as "Ubisoft meets Nintendo". The song is a rearrangement of the Super Mario Bros. overworld theme and its backing video depicts Mario interacting with various elements from the game. This track returned in the Nintendo Switch version of .