Chess Sudoku: King, Queen, Knight Sudoku description

Sudoku originally called Number Place is a logic-based combinatorial number-placement puzzle.

In classic sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.

Completed games are always an example of a Latin square, including an additional constraint on the contents of individual regions. For example, the same single integer may not appear twice in the same row, column, or any of the nine 3×3 subregions of the 9×9 playing board.

Chess sudoku includes king sudoku, queen sudoku and knight sudoku. Rules are simple:
Knight Sudoku: Normal sudoku rules apply, as well as the 'anti-knight' rule, in which no two squares that are a knight's move apart can have the same digit.
King Sudoku: The rules are similar to normal Sudoku: Place a digit from 1-9 into each row, column and 3x3 box only once. No pair of diagonally adjacent cells may contain the same digit.
Queen Sudoku: Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. One number (usually '9') in the grid is a chess Queen. Two Queens cannot be placed along the same row, column or diagonal of any length.

Chess Sudoku: King, Queen, Knight Sudoku has thoundsands puzzles and come in many levels: easy, normal, hard, expert. Players from beginner to expert can choose suitable puzzle for themselves:
Easy and normal sudoku puzzles are suitable for newbie and any people who start to play sudoku.
Hard and expert sudoku puzzles can challenge any professional players and improve their skills.

Rule sets:
✓ Classic Sudoku
✓ Knight Sudoku
✓ King Sudoku
✓ Queen Sudoku

Features:
✓ 2 type of Notes: like make notes as on paper, easy to take note or remove note. You can easily choose which type of note means to you. Each time you fill in a cell, notes are automatically updated!
✓ Check result: players can check what they've filled whenever they want, unlimited time.

Playing Chess Sudoku: King, Queen, Knight Sudoku daily with our game, and we hope to see you soon in the Friend Challenge mode. Stay tuned and happy brain training.