Sound Test is an option that appears in the Super Smash Bros. games.
The Sound Test allows the player to listen to most of the music and sounds in the game. Players can listen to the voices of characters, stage music, and listen to other variety of sounds. If the player leaves the Sound Test while a song is playing and goes back through the menus, the song will still play until it is overridden by another piece of music, or until the player enters the character select screen.
Super Smash Bros.
Sound Test was introduced in this seminal entry, and laid the foundation for all other sound test options in future games. The Sound Test is unlocked by completing Break the Targets and Board the Platforms with all 12 characters. The option can then be accessed through Data Mode. The sounds are split into 3 sections: MUSIC, SOUND, and VOICE. The music and sounds in these sections do not have specific categories, they are instead marked with a number and the player needs to memorize which number goes with which track in which section. The Fighter Select music is not in sound test for unknown reasons.
Super Smash Bros. Melee
Sound Test returns in Melee, with some small changes. The option is unlocked by unlocking all playable Stages. The option can be accessed through Data Mode. Unlike SSB, the name of the track is now displayed on the screen instead of just a number. This was also the first time tracks were organized by series and fighter, making said tracks much easier to find. This method has been kept for every future installment. Generic, menu, and stage sounds each have a singular category, as do enemies and Poké Ball Pokémon. Sheik is grouped under Zelda's category. Kirby's copy ability voice clips are unlocked after unlocking every base game fighter. The Giga Bowser music in Melee is not in sound test for unknown reasons.
Super Smash Bros. Brawl
Sound test once again returns in Brawl, and once again received changes. The option is now available from the start without unlocking, though songs and sounds remain hidden until their source character, stage, or CD is unlocked. It can be accessed through either Data or Option Mode. Brawl introduces the feature of adding a source game to every song and indicating if it was ripped from another game or remixed specifically for the Smash franchise. The Cruel Brawl theme along with the winter version of Obstacle Course is not in sound test for unknown reasons.
Super Smash Bros. 4
Sound test, now simply titled Sounds, is again unlocked from the start with some tracks hidden until unlocked. It is located in the Vault and can also be accessed via the sound settings in Options. Sounds is unique among the series in that one version has unique features the other version does not have and vice versa. Super Smash Bros. for Nintendo 3DS was the first to drop sound effects and victory themes, leaving only music and voices viewable. This version was also the first to introduce alternate costumes with different models (such as the Koopalings or female Robin) feature separate sections from the default ones. Music tracks are indicated by a blue background, while voice clips are in green. The number system is done away entirely and instead has a list of tracks similar in presentation to an iPod interface. The songs do not loop indefinitely anymore and instead fade out after a certain amount of time. The music selection emphasizes handheld games as a reference to the fact that the 3DS is a handheld console. The copyright owner and/or arrangement supervisor of each music track is now viewable in the info section. The main feature of the 3DS version is that the option exists to keep music playing even when the system is in sleep mode. The L and R buttons can be used to skip between tracks. The sleep mode functionality can only be used if headphones are inserted.
Super Smash Bros. for Wii U is mostly similar, with a few key differences. Unlocking hidden tracks is the same, with the additional method of CDs returning from Brawl. The option to play music in sleep mode has been removed. In its place is a dedicated "favorite" section. The player has the ability to star tracks that will then go into the favorite section, where they can be easily found without searching. There are more music tracks than the 3DS version, and the selection emphasizes home console games as a reference to the fact that the WiiU is a home console. Unique to the Japanese version is the voice tracks crediting the voice actors on the info screen instead of just in the credits. However, notably, Kazumi Totaka and Masahiro Sakurai—the voice actors for Yoshi and King Dedede respectively—are credited here, but not in the actual credits. This is not present in any other language version of the game, likely due to the use of uncredited union voice actors in the series' English dubs. In both versions, some character voice clips are missing, such as those of Duck Hunt.
Super Smash Bros. Ultimate
Sounds returns in Ultimate. Like Brawl and Smash 4 before it, the option is available from the start with hidden tracks that need to be unlocked. CDs are removed and replaced with the new method of buying tracks directly from the Shop. Songs are now organized by universe; all major universes except for Duck Hunt and Ice Climber have dedicated categories, with all other universes sharing the "other" category. There is also an "all" category that contains every song from every universe. The ability to play music while the screen is turned off returns from the Nintendo 3DS version. This feature again requires headphones, both inserted into the jack as well as wireless bluetooth as of Nintendo Switch hardware version 13.0.0. The favorite section has been updated into the playlist section; like in the Wii U version, players can star music tracks, with the added option of making and storing multiple unique playlists at the same time. In Ultimate, Duck Hunt's noises are present, but those of Samus and Mr. Game & Watch are still missing for unknown reasons. A peculiarity specific to Ultimate is that, in the Japanese version, songs from English games use the localized English title rather than the original Japanese one. For example, the source game of the English version of Ashley's Song is listed as WarioWare: Touched!, rather than さわる メイド イン ワリオ. The same principle applies in reverse; in the English version of the game, the source game of Lost in Thoughts All Alone (JP) is listed as Fire Emblem: if instead of Fire Emblem Fates.
There are occasions where the Sound Test has sound clips that were never used in-game:
Not in Sound Test
Names in other languages