Tristan solves MIA

[@pokinDave]

If you find someone willing to test your very tough Sudoku puzzle on camera for two hours, keep that guy around! That is both brave and generous.

[@zetamathdoespuzzles]

I am fortunate to have married very well!

[@williammorris7279]

Great comment! I was thinking along similar lines, but you put it well - brave and generous. Conversely, Zetamath's hints are outstanding - really helpful, without giving away too much, and not the slightest sign of impatience. I would deeply appreciate such a guide when faced with a master puzzle like this. A rather touching video.

[@drewskavich]

Awesome solve. Thanks for sharing.