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Sudoku

Abstract

The game board is a grid of 9 rows and 9 columns, grouped in 3x3 blocks. And in each cell of the grid can go a digit from 1 to 9.

At the beginning of the game a few empty cells appear. The goal is to fill those cells in such a way that these conditions are met:

6	4	7
1	2	3	4	5	6	7	8	9
8	5	9
	1
	3
	6
	7
	8
	9

• In each 3x3 block the 9 digits (1,2,3,4,5,6,7,8,9) must appear. That is, none can appear repeated.
• In each horizontal row the 9 digits must appear, none of them repeated.
• In each vertical column the 9 digits must appear, none of them repeated.

Game levels

At top you can select the desired level. The higher the level, the greater the number of empty cells at the beginning.

1 2 3 4

At top you have a stopwatch that measures the time you have been playing in the current game. It is not updated every second, so as not to cause stress and also to save processing consumption. It updates every time you click on the grid.

Your best time on each level will be recorded below the grid as you play. The challenge is to fill in the grid in the shortest time possible.

KEYBOARD bar

Above the central grid there is a bar with the 9 digits that works as a KEYBOARD, which will allow us to fill/empty the editable cells of the grid:

#

X

1

2

3

4

5

6

7

8

9

• To put a specific digit in an empty cell, first click on the digit in the KEYBOARD bar, and once "activated", you must click on the empty cell.
   
• To delete the digit that you have placed in a cell, you can do it in two ways: with the "X" of the KEYBOARD bar, or by activating that digit on the KEYBOARD and clicking on a cell that contains it.
   
• The "#" symbol on the KEYBOARD bar allows you to "mark" cells that you have filled in the grid. The only purpose is to help you remember in some way the cells that seem relevant to remember, for example because you have doubts about the digit placed.

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