I’ve just started learning sudoku with a program Ancient Sudoku. It’s fun, challenging and a bit time consuming. I’ve just started on the easy level and the program does tell me if I’ve hit a duplicate.
My initial technique has been to look horizontally, to see if any of the blocks of nine on the same row have two of the same number – this gives me the row where the third number may exist.
I then repeat this moving vertically.
Afterwards, I go through each block of nine and pencil in the potential numbers that might fit.
Sometimes I find a square that can only be one number, I then fill in the right number. I also end up having to go backwards to see if any previosly filled blocks of nine change based on the new number I entered.
This is a laborious process, but usually gets things done.
Is there a better technique?
Thanks.
n
btw, i’m using a software program / game which tells me if the cell I’ve selected is right or wrong.
If I were doing it in a crossword puzzle I’d have no such help. How do you handle incorrect write-in numbers?
Thanks.