Mr. Upbeat/Development

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). 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.

References

Rhythm Tengoku (GBA/Arcade)
Rhythm Games	Omake Corner	• • • • •
	STAGE 1	• • • • •
	STAGE 2	• • • • •
	STAGE 3	• • • • •
	STAGE 4	• • • • •
	STAGE 5	• • • • •
	Revival	• • • • •
	Technician	• • • • •
	Last Technician	• • • • •
Arcade Only (1P)	Extra	• • • • •
Arcade Only (2P)	STAGE 1	• • •
	STAGE 2	• • •
	STAGE 3	• • •
	STAGE 4	• • •
	STAGE 5	• • •
	Extra	• • •
Rhythm Omocha		• • •
Endless Games		• • •
Miscellaneous		Title • • Rhythm Shiryō-Shitsu • Studio • Perfect Campaign • Characters • The Rhythm League Development History • Sequence Test • Metronome • Dance Lesson 1 • Tanuki & Monkey • Taikenban

Rhythm Heaven Fever
Medal Corner	• • • •
Rhythm Games	• • • •
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Two-Player Menu	• • • • • • • •
Endless Games One Player	• • • • •
Endless Games Two Player	• • • •
Rhythm Toys	• • •
Extra Games	• • •
Miscellaneous	Title Screen • Rhythm Test • Listen to Music • Read Something • Perfect Campaign • Characters • The Rhythm League • Rhythm Heaven • Live House OGU • Development History • Seika Relay • •