Sudoku Rules
Sudoku is a game that consists of 81 cells made up by a 9x9 grid of cells this then has 9 regions of 3x3 grids each containing 9 squares. Each number 1 through 9 exists exactly once in each row, column, and 3x3 region. Your job is to give each of these cells a number with no interference, solving the grid.
Clicking on a open tile will increment this space by 1, starting at blank going to 9 and repeating the cycle when clicked again.
Disclaimer: The term "group" here will refer to any 3x3 region, row, or column.
- All cells have to have a possible number
- A number cannot exist twice in the same 3x3 region, row, or column
- A number cannot be omitted from any 3x3 region, row, or column
If a tile can be any certain numbers based on the state of the board, branch off for each of those numbers.
If a number can be in only certain cells of a group, branch off for each of the cells.
This is a direct violation of rule #2. If a number exists twice in a group the board is in a state of contradiction.
This is a direct violation of rule #1. If a number does not exist in a group and cannot exist in any of the current open cells the board is in a state of contradiction.
This is a direct violation of rule #3. If a cell cannot contain any number the board is in a state of contradiction.
This rule is extended from rule #1. If only one number is left to be possible for this cell, this cell must contain that number.
This rule is extended from rule #3. If only one cell in a group can contain a number, that cell must contain that number.