Cool idea, very tricky! I made it to level 4. I wish you could remove pegs
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My issue with it is I wanted to retry my previous solution after misplacing a peg and it felt very punishing to have to try to remember and slightly adjust when I had it perfect. Pretty frustrating when the game is already difficult. Always good to keep in mind that what seems difficult for a dev is likely nigh impossible for a first time player, I would recommend some rounds of playtesting :)