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Rod's Sudoku Tutorial. Technique 1 starts with a scan of the first horizontal section group(i.e., S1, 2 and 3) and with the digit 1, which will be increased by 1 until it reaches 9. Then you will drop down to the second horizontal group (i.e., S4, 5, and 6) and repeat this technique with digits 1 through 9,with each repetition.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.