 Complete the following phrase:  Like the rest of the Super Smash Bros. series, Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U are non-traditional fighting games where players use different attacks to weaken their opponents and knock them out of an arena. The games are crossover titles that feature characters, items, music, and stages from various Nintendo franchises, as well as from several third-party franchises. The games began development in 2012 and were officially announced at 