mith, elsewhere, wrote:27 digits appears to be the max for a symmetrical pi puzzle; you can get 32 - all the digits before the first 0 - without symmetry, though I haven't looked very far to see if there's actually an interesting puzzle there.

mith, do you have an example of a valid puzzle with all the first 32 non-zero clues? My first attempt was

- Code: Select all
`. . . 3 1 . 4 . .`

1 . . . . . . 5 .

9 2 6 . . 5 3 . .

5 . 8 . . . 9 . .

. . 7 9 . 3 . 2 .

. . 3 . 8 4 6 . .

. . . 2 6 . . 4 3

. . . . 3 8 . . .

3 . 2 . 7 9 5 . . No. of givens = 32

found 9 solution(s)

Adding 6r1c6 yields a valid puzzle.

Thanks,

Mike