Super Mario Galaxy 2, released for the Wii in 2010, introduced Boo Mario as a power-up that allowed Mario to hover and pass through certain walls, and this short cue was stored inside the game's SpkRes archive under the filename CS_TERESA. Teresa is the Japanese name for the Boo ghosts, which explains the file label. Unlike most game audio, the cue was routed to the Wii Remote speaker when the player shook the controller, so many players first encountered it as a sound from their hands rather than from the television, and fans later shared the extracted file online.
About this sound
The Boo power-up chime from Super Mario Galaxy 2, a short ghostly sound that plays through the Wii Remote when the player shakes it to transform into a ghost.
This is the brief, eerie chime that accompanies Mario's transformation into Boo Mario in Super Mario Galaxy 2, a power-up that lets him float through walls and become invisible to enemies. Extracted from the game's sound files as CS_TERESA, named for Teresa, the Japanese name for Boo, it was originally coded to play through the Wii Remote speaker rather than the television, which gives it a thin, close, slightly spooky quality. At under a second long, it lands as a quick magical sting, instantly signalling a ghostly change of form to anyone who recognises the game.