Sudoku.io

Sudoku is a mathematical game originated in Switzerland in eighteenth Century. It is a logic game using paper and pen to calculate. Players need to infer the number of all the remaining spaces according to the known numbers on the 9 x 9 disk, and satisfy the number of each row, each column, each of the coarse lines (3*3), including 1-9, not repeat.
Sudoku disk is a house, every house is divided into nine compartments. In these eighty-one lattices, we give some known numbers and solving conditions, and use logic and reasoning to fill 1-9 numbers in other blanks. So that 1-9 each number in each row, each column and each palace only appears once, so it is also called "nine palaces"".

The algorithm is implemented as follows:

1) Naked Single
2) Hidden Single
3) Hidden Single
4) Naked Pair
5) Naked Triplet
6) Naked Quad
7) Hidden Pair
8) Hidden Triplet
9) Hidden Quad