List of Super Smash Bros. for Nintendo 3DS / Wii U in-game music

Sounds (known as Sound Test in the British English version) is an option found in the Vault of Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U. It consists of all the music and voices in the game.

Players can mark songs as favorites, play through the entire soundtrack or favorites playlist, play them on shuffle mode, repeat a song, and listen to them while the Nintendo 3DS system is in Sleep Mode (headphones are required to use this function).

As for the voices, players can listen to all of the voices of the playable fighters, the announcer (146 voices), Pokémon (36 voices), and Assist Trophies (107 voices). Unlike in Super Smash Bros. Brawl, victory themes and sound effects can no longer be played, and Kirby's copy ability voices are now mixed in with his other voices. Additionally, in the Japanese version, the voice credit can be seen on the corresponding character section.

An official soundtrack features 72 songs selected from both games.

The following is a list of songs in both the Nintendo 3DS and Wii U versions. Including downloadable content, the Nintendo 3DS version features a total of 135 songs, while the Wii U version features 494 songs (495 in the Japanese release, as it features an arrangement of Ashley's Theme not found in the international releases until Super Smash Bros. Ultimate).