Scan Number Place

========== How to play ==========

<< Board area >>

- At first, touch your focus number. Same numbers become highlight in aqua blue. (if you touch again, release highlight.)

- Then if you touch inputtable cell, highlight number is inputted in blue letter. (touch "CE" of keypad to delete it.)

- Touch and slide is to input number as a possibility in the two cells. (click same number of keypad to delete these numbers.)

- To input number under no highlight, touch a cell and click number of keypad. (touch one cell is the answer number, touch and slide is the possibility numbers)

- To cancel recent input, swipe from center to right edge. (last time only)

- When the answer number is inputted, inconsistent possibility numbers are deleted automatically.


<< Elapse time button >>

- Change mode to make a new puzzle, touch cell and set number by keypad.

- Or click camera button and take a picture of a puzzle and automatically recognize base numbers. (adjust 9x9 grid to numbers by moving corners. if recognized number is wrong, modify manually by keypad.)


========== How to solve ==========

1) Touch your focus number, then its possibility cells become light blue in guide-on mode.

2) If there is only one possibility cell in 3x3 block, it must be the focus number. So touch the cell, then the number is inputted.

3) If there are two cells in 3x3 block, touch one cell and slide to second. Then the possibility number is inputted in two cells. (Three or more cells is out of solving.)

4) Consider the possibility number positions and constraints and reduce these numbers, then you can get answer number.

5）Repeat the above from 1 to 9, then you can solve a normal puzzle except for difficult and heavy one.

6) If it could not solved by above, using memory button, choose one possibility number to branch solving. When your selected branch is wrong, restore the memory and choose alternative number.


That's all, you can solve any puzzle.

Enjoy puzzle!


========== solving methods ==========

1) Can reduce two or more possibility to one.

There are two possibility cells of digit 5, but it can not in lower cell because of 4 and 6 occupies. So the star-marked cell must be digit 5.
In lower 3x3 block there are three possibility cells of digit 1, but it can not in right two cells because of upper two digit 1. So the star-marked cell must be digit 1.

2) Can reduce three or more possibility to two.

There are three possibility cells of digit 5, but it can not in lower cell because of 4 and 6 occupies. So only two star-marked cells are possibility of digit 5.
In middle 3x3 block there are four possibility cells of digit 6, but it can not in right two cells because of upper three possibility cells. So only two star-marked cells are possibility of digit 6.
In right 3x3 block there are three possibility cells of digit 4, but it can not in lower cell because of left two possibility cells. So only two star-marked cells are possibility of digit 4.
In right 3x3 block there are three possibility cells of digit 2, but it can not in lower cell because of left two possibility cells. So only two star-marked cells are possibility of digit 2.

3) Considering possibility digit positions.

In middle 3x3 block there are three possibility cells of digit 6, but it can not in right and left cells because of upper and lower 3x3 block possibility cells. So the star-marked cell must be digit 6.
In center 3x3 block there are four possibility cells of digit 4, but it can not in middle and lower cells because of right and left 3x3 block possibility cells. So only two star-marked cells are possibility of digit 4.
The three cells of right column is occupied by digit 4,5,8. So the star-marked cell must be remaining digit 7.