A game of Minesweeper, being played on a tiling of hats instead of the usual tiling of squares. The status bar shows 58 mines marked out of 120 after more than five minutes of playing, suggesting that it's slow going. Also, a solid wall of mines prevents any progress around most of the boundary of the cleared area: it looks as if the only way through is in the bottom left, so it might be necessary to solve all the way along the bottom edge to get into the top right corner at all?