Mr. Upbeat/Development
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An unused test-like game can be accessed through the debug menu of Rhythm Tengoku, where it is known as Metronome (メトロノーム?, Metoronōmu)[1]. Here, the player must press Ⓐ as the needle passes over the bird on the top, playing basically the same as the first test in Rhythm-kan Sokutei. It was reworked into Mr. Upbeat in the final game.