 Complete the following phrase:  Former Nintendo CEO Satoru Iwata first announced that a new Super Smash Bros. game was planned for Nintendo 3DS and Wii U at E3 2011 in June 2011, but development only officially began following the completion of series creator Masahiro Sakurais other project, , in March 2012. The game was later revealed to be a joint-project between Bandai Namco Studios and Sora Ltd., with various staff members from Bandai Namcos Soulcalibur and Tekken series assisting Sakurai in development. Other companies also assisted with its development, such as tri-Crescendo. Sakurai, who was previously the sole person responsible for balance in the series multiple fighters, has involved more staff to further improve the games competitive balance. The game was officially revealed at 