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You're right. Thanks for letting me know. I've just updated the project to hopefully give the puzzle only one solution.

They only require one save file and don't require doing anything in the other pack. The savefile/levelpack shenanigans start just after the top of the map.

Sorry, I had forgotten that level 0 on the right does use a trick that you might not have encountered before, which makes it significantly harder than the opening levels on the left and maybe on par with the extra levels on the left. The right-side versions are intended to be more difficult than the left-side versions.

All the levels before what's at the very top of the main map don't use any meta or hidden mechanics, though the extras could be a difficulty spike.

World 2 is possible to beat in the latest version. It's not trivial and should use all the resources you have in your screenshot (besides maybe the rocks). For a hint, there is a way to bring a key down and to the side with a delicate stars setup. Movement in the bottom section is definitely tight but doable. For the solution, a slightly modified version of what I showcase in my video for this level should work.

https://steamcommunity.com/sharedfiles/filedetails/?id=2619001153

I can see how it may feel like a low blow to discover this gimmick on accident. My intention was to make the next level progressively more difficult to find but when I reached this puzzle I ran out of good ideas. The player is meant to note the cursor and look for level somewhere, but I'll admit this one could be a bit too concealed. At least it's better than hidden text.

yes

Nice pack! Everything's well-decorated and the main levels are just difficult enough while the bonus area is a stumper. The only thing I didn't like was that the first area of puzzles felt a bit repetitive.

Multiple levels with unique additional obstacles