Tutorial 1

Creating From The Answer

If you need the same file of this tutorial, follow bellows instead of whole hand copying Figure 1.

• Hand copy Givens (blue colored numbers) only of Figure 13.
• Select Check Given's Consistency of Edit menu and select Show Answer.
• Select Answers ↔ Givens of Edit menu and select Answer.
• The same numbers of Figure 1 will be shown.
• Select Save As of File menu.

Figure 1. This is an answer generated by Automatic Generator of Edit menu.	Figure 2. We can select any cell first and red-marked 1 is selected in this tutorial. We must fix the cell by following process. Marker is useful to mark off the fixed Answer cell from other unfixed Answer cells. By tapping 'M' button (Marker toggle button), the cell is marked and drawn with circle.	Figure 3. To fix the red-marked 1, The attribute of the four green-marked 1s are set to Given.
Figure 4. Another 1 is selected and marked to fix.	Figure 5. Another two green-marked 1s are set to Given. Now the red-marked 1 is fixed by the two green-marked 1s and another two Given 1s set at Figure 3.	Figure 6. Rest of 1 is already fixed by four Given 1s, so tap 'M' button to mark off from other unfixed Answer cells.
Figure 7. The same works have done for 2s and 3s	Figure 8. The red-marked 4 is fixed by setting only two green-marked 4s to Given because the two cells below of red-marked 4 is already fixed by two Givens (gray-marked).	Figure 9. We don't have to all 4s (or any number) fixing first. We can choose any number to fixing. And this shows some 5-9s have been fixed. Now look red-marked 6. There is no unfixed value except 6 in same box group (green-marked). So the red-marked cell is fixed to 6 without changing any other cells.
Figure 10. In the green-marked group, two cells are not fixed but 7 can not take 9's place because 7 is already used in middle vertical group (gray-marked). Thus 7 and 9 are fixed together without changing any other cells.	Figure 11. We have fixed all cells. Do Check Given's Consistency of Edit menu.	Figure 12. The result is OK! Now we have made first original Sudoku. Don't forget Save to file this and Play it and have fun! But if you are familiar with Sudoku, may be you feel this problem is too easy.
Figure 13. Select Clear Cells and Answers of Edit menu and turn Auto mode of Note menu on. This screen will be shown. There are too many Red Notes and this means player can fix many cells with minimum thinking.	We have used too many Givens (37 in this example). So we need adjust the difficulty of this problem by modifying it. And this is real beginning of struggling of creation.

Adjusting The Difficulty Of Problem

Basics

It is very easy to make the problem easier because it is only changing the attribute of Answer cells to Given. But to make it harder is very difficult because changing the attribute of Given cells to Answer or changing the value of cells may break the consistency. So be careful with every steps of modifying the problem and repeatedly do Check Given's Consistency of Edit menu. In this tutorial, we show some examples to make the problem harder.

Preparing

1. Open the file saved at previous section (We need Figure 11 of previous section).
2. Select Clear Cells of Edit menu and select Answers.
3. Select Auto mode of Note menu.
4. Select View By Note of Note menu.
5. Figure 1 of this section (see below) will be shown.

<TIPS>
View By Note command of Note menu shows also Givens as note. It is useful to analyze problem.

Figure 1. The red-marked cell is Given but the note is only one. It means the cell can take the value only whether the cell is Given or Answer. So we can change the attribute of this cell to Answer keeping the consistency of this problem.	Figure 2. Select the red-marked cell and DOUBLE TAP the 'C' button to clear the value and the attribute. Try Check Given's Consistency of Edit menu. The result must be OK. New seven notes are appeared (black-circled) and two red notes are disappeared (red-circled) by this. Thus the difficulty of this problem is increased a little bit.	Figure 3. How about this red-marked Given cell? It has two notes.
Figure 4. Select the cell and double tap 'C' button. 2 is shown as Red Note, the value of this cell is also fixed whether this is Given or Answer. Now new 2 black notes are appeared and one red note is disappeared. This problem became more difficult than before.	Figure 5. How about this red-marked cell? It has three notes.	Figure 6. Four notes are appeared after cleared the value and Given attribute of the cell by double tapping 'C' button. We don't know whether the consistency is kept or lost.
Figure 7. The result of Check Given's Consistency is Error. We have lost the consistency. We can go back to Figure 5 by tapping Undo button after tap OK of this dialog. But in this tutorial, we select tapping Show Result button of the dialog.	Figure 8. The result shows the four cells can take 1 or 9 each other. But in this case, if any of one cell is fixed, the other three cells wiil be fixed.	Figure 9. We select red-marked cell and set the value to 9 and the attribute to Given. The other three cells are fixed and it must be OK on the consistency checking. Comparing with Figure 13 of previous section, the value of red-marked cell is changed 1 to 9 and we regain the consistency. But be careful with Figure 7-9. This case may be fluke and recovering the consistency may be very difficult in many case when changing Given cell's value.