Movement can be controlled by the WASD keys or arrow keys. Click on the buttons in the bottom right corner of the screen to perform actions.
Number-placing puzzles based on logic are known as Sudoku Challenges. In this problem, you have to fill a 9-by-9 grid with numbers such that each of the nine 3×3 sub-grids (also called “boxes” or “blocks”) contains the digits 1 to 9. In each puzzle, the grid will be partially completed, with only one solution.