# Chapter 2. How to play

You have to use the mouse and its three buttons (with two-buttonned mouses, clicking the middle button is generally achieved by simultaneously pressing the left and the right buttons) to uncover or to flag the cases. Here is the details :

- The left button will uncover a case. Note that left-clicking on a flagged case is secure and do nothing.

- The right-button will mark a case as containing a mine (draw a red flag) or, if the option is set, as being uncertain (draw a question mark). The uncertain tag can be useful when you are puzzled about the positions of mines.

- The middle-button will clear the surrounding cases if there is the right number of cases already flagged. It is very useful since it is much quicker than uncovering all individual cases. Note that if your flags are not properly positionned, you will explode on a bomb.

- Pressing the yellow smiley will start a new game.