Nintendo says it has lent a hand on helping developers include cross-platform play in their games, and that more are on the way.
"We can confirm that cross-platform functionality is possible in certain titles that play on Nintendo 3DS and Wii U, as well as other video game systems not made by Nintendo," the company said in a statement. "We are committed to helping developers realise the full potential of their software on Nintendo systems."
We've known Cubemen 2 would offer cross-platform play, and Nintendo's statement to VG247 noted Pure Chess as well--though that title is awaiting approval from Sony as well. The statement also mentioned Disney Infinity, which interacts with mobile apps. Nintendo also teased, "Additional games using this functionality are in development."