The New Sudoku Players' Forum

[mith]

Not sure if this has been discussed here. A 73-cell palindrome had been previously found for a toroidal grid, but last night I was able to construct a non-crossing 73-cell palindrome in a normal 9x9 sudoku grid:

https://f-puzzles.com/?id=yy9527mc

(This is the maximum possible - you can only have an odd count of one of the digits, whichever is in the center of the palindrome. Not a hard puzzle, more a theoretical curiosity. Would be interested if such an example had already been found somewhere, google is failing me.)