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Can reuse a lot of irregular logic, so it's mostly builder + visual difference.
https://logicmastersindia.com/live/?contest=SM202401
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https://lisudoku.xyz/collections/32
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https://logicmastersindia.com/live/?contest=SM202401
Puzzle 11
https://lisudoku.xyz/p/NCgk-NJetlC70m-rYEIt
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The intended solution can't be this complicated 😄 There must be something arrow-specific that can be used.
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Puzzle 3.1 http://www.wspc2023.com/downloads/16thWorldSudokuChampionship-InstructionBooklet-v1.pdf
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Maybe solve this puzzle https://youtu.be/4bst5RLjyTQ
But look for an easier one
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Digits in any three consecutive cells in any row or column must not be of the same parity.
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For https://lisudoku.xyz/collections/21