Which Rhythm Heaven game introduced holding the Wii Remote's A and B buttons together?

Rhythm Heaven Fever introduced holding the Wii Remote's A and B buttons together. This two-button squeeze became the Wii game's defining control action, alongside pressing the A button alone.

Released for the Wii in Japan in 2011 and internationally in 2012, Fever followed the Nintendo DS game's stylus-based controls. Nintendo deliberately simplified the input method: players use only the Wii Remote's A and B buttons, with timing and listening carrying more importance than complex button combinations.

The game contains 40 main minigames, arranged into sets that culminate in Remix stages. Its controls are sometimes confused with Rhythm Heaven Megamix, which returned to Nintendo 3DS controls, or Rhythm Tengoku, whose Game Boy Advance version uses the console's buttons. Fever also includes cooperative stages for two players.