Polyrhythm

Polyrhythm (ポリリズム) is the 22nd minigame in Rhythm Tengoku. It features Akai Mono that roll around and bounce on an assembly line. The arrange variant appears later on called Polyrhythm 2.

Gameplay
This game is structured on a grid with two pathways. Before the player starts, a rhythm is tapped out, using a bass drum to represent the lower path and a snare drum to represent the upper path. After this finishes, a rod will roll out, requiring the player to repeat the given pattern using the D-Pad for the top row and A button for the lower row. After the pattern is repeated, a new one is tapped out. The patterns sometimes vary between paths.

Trivia

 * This game appears to have inspired multiple aspects of Built to Scale in both Rhythm Heaven and Rhythm Heaven Fever, such as the general art design. Because of this, many fans consider this game to be a predecessor.
 * This game, Polyrhythm 2, Toran to Porin, Catchy Tune, and Catchy Tune 2 have similar controls/rhythm.
 * This is one of the few games that doesn't feature a practice in the series.
 * It did, however, get a tutorial in the arcade version.