This is a version of the classic strategy game of “Mine Sweeper” but with emoji happy faces instead of bombs. Stategically click to uncover empty areas and avoiding the “mines”.
Squares with numbers are hints that tell you how many adjacent mines there are (either to the left, right, top or below the square with the number). So for example, a square with a 2 on it has a mine adjacent to two sides of it. The question is, where exactly are they?
If you are pretty sure where a mine is located, you can mark that square with a flag (and get points for it) by holding the CTRL key while clicking the square.