pull down to refresh

This one is extremely difficult, I only managed to find 2 numbers.
That's by design... it was designed by a mathematician named Arto Inkala.
Supposedly, it takes one to be able to think 7-8 moves ahead to be able to solve this one.
I hope you did not spend too much time on this. Trial and error is the common strategy to solve this one by expert sudoku solvers.
reply
I still spent half an hour but only managed to put in these two numbers for sure. Other numbers would be a trial and error, as you say.
reply