Compressed Sudoku
Inspiration for this variant comes from Sudoku Cup #5
Solve online in Penpa+ (thx bbutrosghali!)
Fill in the whole grid with numbers from 1 to 9, so that no number is repeated within a row, a column, the four grey 3x3-blocks or the five outlined 3x3-blocks.
Solution code: Column 1, followed by column 4.
on 29. December 2024, 10:42 by sisk0
Sudokupad link:
https://sudokupad.app/6oh9q051jo
on 14. July 2022, 16:43 by Richard
Added link and tag for online solving. Thx bbutrosghali!
on 5. April 2021, 18:57 by bbutrosghali
Penpa:
https://git.io/JYQ2Z
on 28. December 2016, 14:13 by ohm0123
It's hard.
on 26. January 2016, 08:33 by Statistica
Ein richtiger 'Teufelsknoten' :-)
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