 Complete the following phrase:  At E3 2011, it was confirmed that a fourth Super Smash Bros. game would be coming to the Nintendo 3DS and Wii U, with the two games being cross-compatible with each other. Sakurai stated that the announcement was made public in order to attract developers needed for the games, as development for the games did not start until May 2012 due to production on . On June 21, 2012, Nintendo announced that the creation of the games would be a co-production between Sakurais Sora Ltd. and Bandai Namco Entertainment. The games were officially revealed at 