Click begin to start a round. It's similar to "Voltorb Flip" from Pokemon HGSS. The top number represents the number of "mines" in the row (if it is to the right of the green squares) or column (if it is under the green squares). The bottom shows the total of all non-mine tiles in the row or column. You win if you collect all the points. You lose if you click a mine.
Old, half-finished project that I've decided to share. Inspired by Pokemon HGSS's Voltorb Flip minigame, though my implementation is slightly different (ie worse). The unused menu sprite is inspired by Persona 5. I don't remember what I intended to add to the game beyond what is already present.