Keep your hands warm, but if your hand starts to sweat while you're playing, wash it (I wash mine every 10 to 15 minutes). It's difficult to click. That number is the number of how many mines are surrounding it. I ve been playing this game for years and i never knew how to determine which square to. Most people like to just click around the program hoping to not hit a mine, but if you want to master the game, then you have to play with strategy. The most.