Butterfly Effect
(Published on 14. August 2026, 12:56 by PrissyP)
Sudoku:
Normal Sudoku rules apply independently to both grids.
Cages:
Digits within a cage cannot repeat and must sum to the number shown in the upper-left corner of the cage.
Twin Cages:
Every cage has a corresponding twin cage in the same position in the other grid.
For colored cage pairs, the two cages must contain exactly the same set of digits. The digits may appear in different positions within the cages.
For red-bordered cage pairs, the two cages must contain different sets of digits. They may still share some digits.
Solution code: Digits that are in the same position in both grids in the first three rows. Left to right, top to bottom.
Comments
on 22. September 2026, 04:05 by yuripuppies
This was such an interesting puzzle!
on 22. August 2026, 23:00 by ViKingPrime
The true test of any setter is to make a puzzle that is both incredibly approachable and incredibly interesting, which you achieved here. This was a joy to solve.
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Thank you for the very kind words. I'm happy you had a good time with the solve.
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on 18. August 2026, 16:50 by MattYDdraig
Incredibly clever and fun puzzle! Enjoyed that a lot.
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Thank you. Nice to hear that you enjoyed it!
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on 14. August 2026, 19:21 by philolologue
This was loads of fun, one of my favourite puzzles in a while! Took me a bit over an hour, never got bored or too stuck, just the reasoning was challenging enough to slow the pace and the extra time to solve two grids instead of one made for a lovely afternoon break! Thanks for posting, brilliant work!
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Thank you so much for these very kind words. I am happy you enjoyed the puzzle so much :)
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