* Challenge puzzle, simple but difficult.
* Dont be panic to arrange random dot number.
[How to play]
1. link 1, 2, 3(4) dot number orderly and repeatedly.
2. all dot number is linked and cleared.
3. from one point, you can move to eight direction (horizontal, vertical, diagonal)
4. linked dot number is not be again.
5. diagonal linking is not moved by cross(line shape is X).