One of Nintendo's strongest traditional partners has said that it won't create exclusive titles for the Wii U as long as the system's poor sales continue. Speaking to Kotaku at this week's E3 conference, CEO Yves Guillemot said, "We need more sold." Ubisoft is one of the few publishers to release a bona fide Wii U exclusive — horror action game ZombiU launched with the system last year — and Nintendo has historically enjoyed solid third-party support from the company.

Guillemot expressed hope that Nintendo's own titles might spur further sales of the struggling system. Nintendo typically releases the best-selling games for its own consoles, and this week the company showed off new entries in the Super Mario, Legend of Zelda, Mario Kart, Super Smash Bros., and Donkey Kong Country series.

Wii U will still get non-exclusive titles

Ubisoft's upcoming Rayman Legends was originally announced as a Wii U exclusive, but the company decided to delay its release and work on versions for the Xbox 360 and PlayStation 3. The Wii U will continue to see versions of Ubisoft titles that appear on other systems, such as Watch Dogs and Assassin's Creed IV: Black Flag. Electronic Arts has said that it is not currently developing any games for the Wii U, exclusive or otherwise.

As development for PS3 and Xbox 360 titles — the Wii U's rough technical equals — slows in favor of next-generation systems, it's not clear if the Wii U will have the user base for Ubisoft to devote its resources to. Since Nintendo's system is less powerful than its forthcoming rivals, it will be more difficult for the company to scale games down than port across versions designed for current consoles.

Future Ubisoft titles may be a good fit for the Wii U's tablet-style GamePad controller, however; the company demonstrated second-screen tablet functionality for its next-generation title The Crew at E3. "We can also use [the second screen] with the other consoles with SmartGlass, for example, and it’s a good option that is coming to us," said Guillemot. "If you look at us this year on Wii U we will have a lot of products."