Tip: You can use Lunar Magic's Overworld Layer 3 Editing system to edit or create your own layer 3 images (castle bricks, fish, rocks) and apply unique effects per level via the Layer 3 Bypass in the main editor.
this hack is TOUGH AS NAILS, and it gets a bit boring with the backtracking near the end, but i still enjoy it a lot! i don't know exactly how to put it, but it feels like it had a lot of thought put into it. there's lots of interesting ways this hack uses enemies, and it feels like an achievement when you beat it without savestates/rewinds of any kind. again, it's very challenging, so you'll definitely need to be a hardcore yoshi player to beat this. it does take about 45 minutes (give or take) to 100% it in one go, even when you know what you're doing, so that's crazy. i can beat it with some deaths; the snow/fuzzy section and the balloon ride are both killer.
a tip for less backtracking: in the dirt maze with the spotlight and melons, once you use the green melon to open up a path on the right side of the map, and to get a flashing egg, you NEVER need to use that green melon ever again! the ice melon will also open up the same path on the right side if you get close enough to the ? cloud with your ice breath. trying to be vague here because of spoilers, but you might know what i'm talking about when you play to that point.
another tip: don't stress too much about your star count, because you'll only need 15 stars when you reach the fourth (and final) middle ring. the ring will bump you up to 25 stars, and all you'll need after that is a 5-star ? cloud.
does anyone find this easier than 6-S from new smw2 yoshi's island? i still can't beat that one haha
also, can anyone even get 100% on the level "victory shall be golden yoshi's!"? that one requires ridiculously precise moves. i try to play hacks toolless if i can, but that one broke me.