#381-385: Revisiting 4x4 Sudoku
made on 5/26/23
Back in August 2022, Cray had introduced a few 4x4 Sudoku variants.
381. Square Sum Sudoku
https://f-puzzles.com/?id=2pyegd67
382. Invisibulb Sudoku (very hard!)
https://f-puzzles.com/?id=2e2jf6vr
383. Invisibulb and Square Sum
https://f-puzzles.com/?id=2l869w9t
384. Invisibulb or Square Sum?
https://f-puzzles.com/?id=2h4vucpr
This also inspired me to do something silly:
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