2-in-1 Wooden Chess Puzzle Game

The objective of Jiugongge sudoku 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”, “regions”, or “subsquares”) contains all of the digits from 1 to 9;

Sudoku puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.