Four Corners
(Published on 15. August 2026, 18:28 by sanabas)
Good Luck!
Questions, comments, feedback are always welcome, either here or on the CTC community discord.
The rules:
Normal sudoku rules DO NOT apply.
Normal Schrodinger Sudoku rules apply. Fill the grid with the digits 0-9 such that no digit repeats in a row, column, or box.
S-cells: In each row, column, and box there is exactly one S-cell. S-cells contain two digits instead of one, and their value for the purpose of other clues is the sum of those digits.
Doublers: One cell in each row, column and box is a doubler. For the purpose of other clues, the cell's value is double the digit (or digits) in the box. Each digit from 0-9 appears exactly once in a doubler cell.
Region sum lines: On blue lines, the sum of values on the line is equal in each region the line appears in. Different lines may have different sums.
Killer cages: Digits do not repeat in cages (though values may repeat) and values sum to the total in the top left corner of each cage.
Kropki: Values in cells separated by a black dot have a 2:1 ratio. Not all dots are necessarily given.
Some of my previous puzzles:
Give it the Finger
Xban
Chaos Dancing
If you enjoy this one, please try them too.
Solution code: Row 2's values, left to right
Comments
on 4. October 2026, 23:48 by sacker
Perfect 5*, every deduction is a new twist. A perfect puzzle to chip away at, thanks!
on 2. October 2026, 19:26 by Kafkapharnaum
FInally got around to playing this one, and much like the first puzzle I tried from you, it did not disappoint! Incredible ouverture and treatment of doublers throughout, that actually threw me off pretty quickly and I broke it, being my careless self. Now of course I’m not a prolific solver by any means, but this puzzle is full of things I’d never seen before, whether in puzzles I solved, or on CTC, and I’d really, really love to see a feature of that one!
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Thanks for the kind words again. Glad you enjoyed it. I think this one and I forget what 8 was for are my two favourites.
on 16. August 2026, 22:09 by Myxo
Amazing!
on 16. August 2026, 20:17 by Snookerfan
Brilliant puzzle! Whenever you feel really smart, you should humble yourself by trying one of Sanabas's puzzles, thanks for the challenge.
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I want to start using a sig, just to put that quote there. :D Glad you enjoyed it.
on 15. August 2026, 21:28 by amirs
It was a tough one for sure and took me quite some time but I never felt stuck. Great challenge, very satisfying all the way through.
on 15. August 2026, 18:32 by Jooshy
Quite difficult, but well worth it, brilliant use of combining both modifier cells to create new logic. Thanks for sharing!
