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. In Super Smash Bros. and Melee, the Sound Test can be accessed through Data Mode; in Brawl, it can be accessed through either Data or Option Mode; in SSB4 it is located in the Vault and can also be accessed via the sound settings in Options. 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.
Some pieces of music are unavailable in the Sound Test for unknown reasons; this includes the Fighter Select music in SSB, the Giga Bowser music in Melee, and the Cruel Brawl theme along with the winter version of Obstacle Course in Brawl. SSB4's Sound Test is missing some character voice clips, such as those of Duck Hunt. In Ultimate, Duck Hunt's noises are present, but those of Samus and Mr. Game & Watch are still missing.
In SSB, musics and sounds does not have specific categories; from Melee onwards, they are organized by series for music, and by characters for sounds, as well as generic, menu and stage sounds are grouped together under certain categories. Transformative characters like Sheik in Melee and Brawl, helper characters like Pikmin, and summonable characters from some Final Smashes (such as the Phantom Thieves of Hearts in All-Out Attack) are grouped under the main character's section (in aforementioned cases, being Zelda, Olimar and Joker respectively). Conversely, alternate costumes serving as alternate "characters" in SSB4 and Ultimate (such as the Koopalings or female Robin) feature separate sections from the default ones. While Pokémon Trainer made return in Ultimate, the Pokémon's sound sections are now separate rather than being grouped together, likely due to the female variant being added. Pokémon appear from Poké Balls, Assist Trophies, enemies in Brawl's The Subspace Emissary are also grouped together by organizations. In Brawl, bosses had single section by a character, but in SSB4 and Ultimate, they are also grouped together under the "Enemy" category. As only voice clips are only accessible in latter games as mentioned above, only four bosses and stage hazards are listed (Master Hand, Crazy Hand, Viridi in Reset Bomb Forest, and Metal Face in Gaur Plain).
In Super Smash Bros. for Nintendo 3DS, the Sounds section can be set to play music even when the Nintendo 3DS is in sleep mode, with the L and R buttons used to skip between tracks, though the player can only hear the song play if they have headphones.
There are occasions where the Sound Test has sound clips that were never used in-game:
Not in Sound Test