Sudoku

As I was cleaning out the cupboard in the bathroom I came across a sudoku puzzle book.

According to Wikipedia

Sudoku, is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution.

Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same 9x9 playing board row or column or in any of the nine 3x3 subregions of the 9x9 playing board. The puzzles were popularized in 1986 by the Japanese puzzle company Nikoli, under the name Sudoku, meaning single number. These became an international hit in 2005.

A sudoku puzzle... ..and it's solution numbers marked in red. After putting everything back into the cupboard I sat on the floor and had to complete a puzzle cause yeah I am hooked!

Blessings