Normal sudoku rules apply.
Global arrangement: Sort the digits 1-9 into three unique sets of three digits. Each set must sum to 15. Every 2x2 arrangement of cells in the grid must contain at least one number from each set.
Arrows: Digits along an arrow must sum to the number in the attached circle.
Solution code: Column 2, top to bottom
today, 10:16 by Snookerfan
Very nice, fun twist on global entropy! Thanks
yesterday, 21:08 by Bankey
Fun puzzle. Thanks, @ sisaloofafump :).
yesterday, 19:25 by rdesmarais2
Awesome puzzle! Thank you!
yesterday, 13:51 by AnebodaSlatorp
Really cool idea thank you
yesterday, 09:20 by BlackRaven
Amazing puzzle
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