moodsweeper

Click a square to dig. A number tells you how many mines touch that square. Right-click (or long-press on a phone) to stick a post-it on a square you think hides a mine. Click a number once all its post-its are down to clear the rest around it. Dig up every square that isn't a mine to win.

Honestly? None of us knew how to play either. We looked it up. We think we've got it right.