Micro-Row/Unused

Rhythm Heaven Fever
Micro-Row consists of the following versions in Rhythm Heaven Fever:

Unused Content
The color trail the Microbes leave behind is shaped like stars, squares and triangles. There is also a variant where each step of the trail is a circle. While this variant goes completely unused in Rhythm Heaven Fever, it eventually does get used in Citrus Remix in Rhythm Heaven Megamix, however.

Rhythm Heaven Megamix
Micro-Row consists of the following versions in Rhythm Heaven Megamix:

Unused Content
According to the debug menu of Rhythm Heaven Megamix, an arrange version of Micro-Row was planned, which would be Micro-Row 2 from Rhythm Heaven Fever. This is further supported by the existence of strings for the arrange verison's Rhythm Item, leftover Practice strings, and empty strings for comments on the two-step move, in Rhythm Tengoku: The Best+'s data, though they are blank.

The game also has the two-step move from the original, and an icon for the Museum, which is based on the Two Player version of Micro-Row as opposed to that of the original Micro-Row 2. There are two unused variations of the bubbles which appear during the latter half of the games. One looks like five-sided organisms, while the other is blank. As these variants are stored between the used bubbles (which were designed with the long version in mind), and followed by the one used in Citrus Remix, it is likely these were intended to be used in the short version and the unused arrange version, respectively.