An incomplete sudoku.
An incomplete sudoku.
This is how a typical sudoku looks like.

According to Wikipedia, Sudoku is a logic-based, combinatorial number-placement puzzle. In classic sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called “boxes”, “blocks”, or “regions”) contain all of the digits from 1 to 9.

These are the rules of the regular sudoku:

  • Each row must contain every number from 1 to 9 exactly once.
  • Each column, similarly, needs one of every number from 1 to 9.
  • Each 3x3 ‘region’ needs to follow the same 1–9 pattern.

Knowing what a…

Kevin Andrey Romero Oviedo

I am a programmer, casual gamer, full-time geek, and math enthusiast.

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store