Kirby Squeak Squad (Japanese 2006 October multidemo): Random memory modifying shenanigans
It only took a few byte changes to break this in more ways than one. From abilities completely unavailable within the boundaries to unused bottom screen backgrounds, yeah, there's interesting stuff in here.
Unfortunately though, everything beyond World 2 doesn't exist in the demo's data, so attempting to enter a level beyond that will crash the game. At least it seems like the unused test rooms from the final up to World 2 still exist, although I haven't managed to load them yet. It might be possible to reinsert the levels from the final game into the demo, but that would only be useful to see if any objects were programmed differently and I lack the knowledge to do it.
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