Built to Scale (ポリリズム poririzumu?) (Directly translated as Polyrhythm) is the 22nd minigame in Rhythm Tengoku. It features the red small rods called Widgets that roll around and bounce on an assembly line. A sequel appears later on called Built to Scale 2 (Polyrhythm 2). Attaining a perfect gets the lyrics: Sweet Angel from Remix 3 for this game that you can read at the E-mail.
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.
D-Pad: Bounce Rod (Upper Area)
A: Bounce Rod (Lower Area)
Hit: The rod bounces to the next block.
Barely: The rod bounces on. A barely counts as a miss.
This game appears to have inspired multiple aspects of Built to Scale in both the DS and Wii versions, such as the general art design. Because of this, many fans consider them to be one and the same, although there are many differences.