Rules:
The center of the looong palindrome is R5C6. (highlight to see)
Solve online:
CTC Another version using colored line for tracking purpose (The colors have no other meaning.)
Note: Answer check is only for sudoku cells.
Enjoy!
Solution code: Row 7 (9 digits)
on 6. August 2025, 04:44 by marcmees
incredible construction. very hard to unravel. thanks
on 3. August 2025, 17:57 by Qodec
Magnificent.
on 3. August 2025, 13:35 by Inge
Very hard but very nice puzzle!
Thanks
on 3. August 2025, 12:59 by Visumation
Very cool construction. Thanks
on 3. August 2025, 08:15 by Piatato
Lovely!
on 2. August 2025, 20:17 by AnebodaSlatorp
Challenging and fresh
on 2. August 2025, 20:00 by damo_89
Very impressive construction. Hardest thing I found was finding a notation method to keep track of everything. I found the letter tool and colours very useful. Once you find a suitable notation the logic isn't THAT hard..
on 2. August 2025, 14:10 by lcy.30
A nice colouring puzzle. The difficulty is just right for me.
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