The fourth and fifth iteration of the Super Smash Bros. series, released on both the 3DS and the Wii U.

Super Smash Bros. 4 (often shortened to SSB4, Smash 4, or Sm4sh) is the popular name for both Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U. While the two games are on different platforms, they feature the same mechanics and playable characters, and are designed to be halves of a pair - the 3DS version has StreetPass functionality and Smash Run, for example, and the available stages are completely different between the two versions.

Super Smash Bros. 4 on SmashWiki