Sudoku 4 in 1

Sudoku is a popular logic-based puzzle game that can be played online. The game Sudoku 4 in 1 involves a 9x9 grid, divided into nine 3x3 sub-grids. The objective is to fill each of the 81 cells in the grid with a unique number from 1 to 9, ensuring that each number appears only once in each row, column, and sub-grid.

To play, click and hold on the empty cell where you wish to place a number, then drag the desired number to the cell and release the mouse button. Ensure that each number is placed in a unique position within each row, column, and sub-grid.