Old tiles
There is a very old computer game that is called ‘Minesweeper’ that we used to play all the time when we were young. That’s right, we are that old and can remember the default games that came with each computer. We just never understood how to play the game and always got frustrated.
You are shown a grid in the game that has a bunch of squares. Now when you click on one square it may reveal a mine or a number giving you a hint about where other mines could be. You win by not clicking on the hidden mine and blowing up. Sounds easy enough right?