From Grand Poo World 2, by Barb: https://www.smwcentral.net/?p=section...
The first of two bosses I did for Barb's hack, Grand Poo World 2. The theme for this one was, unsurprisingly, Chucks; every kind of Chuck (except clapping) was incorporated into the fight, plus one extra surprise at the end. Also, it may not surprise you to hear that getting this boss to run with minimal lag was a challenge. There were a hundred corners cut in the background to optimize it, ahaha.
...Though, unfortunately (or perhaps fortunately), the version of the boss in the current v1.1 release of GPW2 has a bug in it that prevents the split-into-three attack. Not that it makes the fight much less hectic, though.