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 Sakurai's 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 Namco's "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 game's competitive balance. The game was officially revealed at E3 2013 on June 11, 2013, during a Nintendo Direct. Along with screenshots being posted each weekday on the game's official website and Miiverse community, various cinematic trailers were released, introducing each of the brand new fighters. Sakurai chose to use these trailers, which benefit from Internet sharing, as opposed to including a story campaign similar to the Subspace Emissary mode featured in "Brawl", as he believed the impact of seeing the mode's cinematic cutscenes for the first time was ruined by people uploading said scenes to video sharing websites.