Super Smash Bros. for Nintendo 3DS and Wii U

Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, collectively known as Super Smash Bros. 4, are two 2014 crossover fighting games developed by Bandai Namco Studios and Sora Ltd. and published by Nintendo for the Nintendo 3DS and Wii U video game consoles. It is the fourth installment in the Super Smash Bros. series, succeeding Super Smash Bros. Brawl (2008). The Nintendo 3DS version was released in Japan on September 13, 2014, and in North America and Europe on October 3, 2014, and Australia on October 4, 2014. The Wii U version was released in North America on November 21, 2014, Europe on November 28, 2014, and Australia on November 29, 2014 and in Japan on December 6, 2014.

As part 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 announced at E3 2013. The gameplay was tuned to be between that of the faster, more competition-oriented Super Smash Bros. Melee and the slower, more casual-friendly Super Smash Bros. Brawl.

New features include having up to eight players fighting at a time on the Wii U version, support for Nintendo's line of Amiibo (being one of the first games to do so), using custom Miis as playable fighters, post-release downloadable content including additional fighters and stages, and customizable special moves. Some features from previous games in the series were removed, such as the story mode from Brawl. Critics applauded the fine-tuning of existing Super Smash Bros. gameplay elements but criticized some issues with online play. Both versions sold well, with the 3DS version selling over nine million copies worldwide by September 2022 and the Wii U version selling over five million by the same period. It was followed by Super Smash Bros. Ultimate for the Nintendo Switch in 2018.