Guess: Words must alternate between vowels (including y) and consonants, with vowels in alphabetic order (and I guess be at least 4 letters in length, and start with a consonant)
(just a second, trying to figure out which of the rules I have in mind would work best)
Alright, here we go:
A valid koan is a 3x3 grid made up of Xs and Os. (For easy typing, you can read the rows off and put slashes between them. You can also use shift+enter.)
Guess: Exactly one tile can be toggled (O to X, vice versa) in order for exactly two winning tic-tac-toe lines to be on the board for the same tile type (O or X) as what was toggled to
@notjagan It didn't? Seemed to work to me. You can't do the toggle to get exactly two tic-tac-toe wins of any type, but it's true according to my rule.