Wise owl has ended up putting two 7’s in the same row and now does not have the energy to backtrack and find where he made the error.

To play interactively, get Simon Tatham’s Portable Puzzle Collection (for example F-Droid or online), open Solo, and start game by Game ID:

3x3:6c5e3a1a2d2_7g8e2k9e5g2_4d5a3a8e1c3

Edit: Fuck that, it’s fake