1. I think I only got one grid that was unsolveable.
2. That was my first grid.
3. I was only playing with addition.
4. I completed exactly one round.
Because the "unsolveable" grid was my very first, I may well have pressed on without investigating too much, because perhaps things would become clearer; and indeed, all subsequent grids were easy to solve.
So please don't treat my comment as a bug report! If you've taken trouble to avoid that outcome, then almost certainly the error is me.
Comments
OK, so:
1. I think I only got one grid that was unsolveable.
2. That was my first grid.
3. I was only playing with addition.
4. I completed exactly one round.
Because the "unsolveable" grid was my very first, I may well have pressed on without investigating too much, because perhaps things would become clearer; and indeed, all subsequent grids were easy to solve.
So please don't treat my comment as a bug report! If you've taken trouble to avoid that outcome, then almost certainly the error is me.
Thanks for the additional info! Glad to hear you at least didn't run into it again. I'll definitely do some more testing just incase