Sudoku 9

Enjoy the challenge with this puzzle game. It presents a grid of 9 columns and 9 rows in 3×3 squares, each consisting of 3×3 fields. Every solved puzzle contains a set of numbers from 1 to 9 in every column, every row, and every square. In each of those, each number from 1 to 9 only appears once. Every puzzle presents one unique solution.

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Briefly check the entire grid for a general impression of the given puzzle. Some fields will already contain some clues. Check the concentration of the empty fields per columns, rows, or boxes, whichever is preferred. Any column, row or cluster can also be referred to as a house. Easier puzzles will only have a few empty fields and offer lots of clues. The emptier the grid is, the fewer clues that will be obvious, but they will still be there.

Start in the area with the least number of empty fields. If only one number from 1 to 9 is missing in any of the columns, the rows, or the boxes, then the missing item is simply that missing number. Fill that number in and continue with other empty fields in the same manner.

The easiest games might only require filling in some singlets, those are fields with only one possible candidate. Find out which number is missing and place it in. If the selected number is correctly chosen, and when all the occurrences of any item are set, the item will be highlighted.