Spaceball/Unused

Rhythm Tengoku
Air Batter consists of the following versions in Rhythm Tengoku:

Unused Content
There are two unused sequences for Air Batter, likely early versions of the game. Both of them use "Game Select 2" as the music. Both play similarly to the final version, though both end with a slight speed up, during which the batter hits stars (which are not seen anywhere else) before finally hitting the rice ball. The second variation has most objects on the offbeat, but is otherwise identical to the first variation. They cannot be accessed through Sequence Test. The ideas of offbeat baseballs and the speed up can be seen in Air Batter 2 in the final game.

There are various unused sprites in the game, those being a flowerpot with a face, an apple and the aforementioned star. The latter two are replacements for the baseballs, and have smaller variants for the zoom outs as well.

In the arcade exclusive Air Batter Tempo Up!, the swinging animation resets to idle before the final frame can be displayed due to the speed, leaving it unused.

Rhythm Heaven Megamix
Spaceball consists of the following versions in Rhythm Heaven Megamix:

Unused Content
There are unused sprites of a leaf mask as a replacement for the bunny mask, and unused animations of Space Umpire outside its spaceship dancing, both found in Lush Remix.