The browser version of "Sudoku Kyo" has posted a large number of good questions that can be solved without provisional problems, and has been evaluated by many users by dividing them into small levels from simple problems to difficult problems.
Furthermore, we succeeded in creating a super-difficult problem by creating an original AI that researched Sudoku. Most of the difficult problems sold in the general market can be solved only with basic techniques, but the difficult problem of "Sudoku Kyo" is to use the swordfish twice and overturn the difficult problems of Sudoku such as XYZ wing. We have prepared a series of super difficult problems.
[Answer to the application explanation problem]
The answer is .
Since  is placed in one of the four cells of the image in the X wing, you can delete the memo number  in [Row 3 column 3] [Row 3 column 7].
The Y wing is made up of the pink squares in the image. When the pink square on the upper right is , the pink square on the lower right is , and when the pink square on the upper right is , the pink square on the upper left is . I can't put it in.
Of course, there are only 300 new questions up to level 1-8 that can be solved without duplicate solutions and without temporary placement.
In addition, we have added 300 new questions for difficult Sudoku up to levels 1-8.
[Difficult question Sudoku]
This is also a problem that can be solved logically. However, technique is required, and if it is a general difficult problem collection, it is about level 1-2 of difficult problem Sudoku. In other words, it should be a difficult problem that you have never experienced. A super difficult problem that looks easy and cannot be solved. Please try it.
The usability is the same as the browser version and it is easy to use. Memo function and coloring. Start over. There is an unlimited hint function, and the solved time is also recorded.
Sudoku Kyo APP can be solved slowly offline. It can be used as a companion for a short gap time or commuting to school, and you can also enjoy the difficult problems carefully (packets are used for displaying advertisements).
[How to use]
Confirmed number, memo number tabular tap input
You can also set the cell color and text color.
The role of each button
C: Clear cell
Copy / Paste: A function to copy and paste a memo.
From the beginning: Start over with the problem
Suspend / Return: Saves the intermediate stage. (There is also auto save)
Tip: Show the wrong cell in red.
Next move: Randomly tells you the next move.
[Technique used in Sudoku Kyo APP]
Naked Pair Triple (Two-Country Alliance / Triple Alliance)
Hidden Pair Triple (Hidden Bilateral Alliance / Hidden Triple Alliance)
Naked Quad (Quadruple Alliance)
Hidden Quad (Hidden Quadruple Alliance)
Extended Unique Rectangle
Hidden Unique Rectangle
Align Pair Exclusion
Group X cycle
X-wing with fins
Swordfish with fins
AIC (Alternating Inference Chain)
Digit Forcing Chain
Nishio Forcing Chain
Cell Forcing Chain
Unit forcing chain
Pattern overlay method