"Check3" Game

Check3 is a fascinating game, a bit like Sudoku. In order to play, you only need the left mouse button. The playing field consists of many cells. And, as you may have already noticed, some of them are already occupied - there is a red cross. You can not change these cells or move them around. You must place the green checkmarks. And do this in such a way that these checkmarks do not stand with each other, do not intersect horizontally, vertically or diagonally. Those cells that will not be used, mark with a gray cross by double-clicking them with the left mouse button.

By clicking on the circles you can put checks or crosses.