The Grid
========
The Grid is made up by a number of squares(explained earlier). There are
five different types of squares in the game: Covered Squares, Empty
Squares, Numbered Squares, Flagged Squares, and Question-marked Squares.
There is also a sixth type: Squares with mines underneath, but if you
see one of these it means Game Over.

Covered Squares
===============
When the game begins, every square will be covered, and it is up to you
to discover in which squares the mines are. Left clicking on one of these
squares will reveal one of the following squares underneath.

Empty Squares
=============
These are the Squares which have no mines and are not surrounded by mines.
These squares are your best friend, as uncovering a bunch of these will
give you great access to the rest of the grid.

Numbered Squares
================
These are the squares you use to decipher where the mines are hidden.
Each of these has a number which determines how many mines are in the
surrounding 8 squares(e.g. North, North-East, East, South-East, South,
South-West, West, and North-West of the square).

Flagged Squares
===============
Right-click on a covered square to flag it. Flagged Squares are squares
which you have indicated contain mines - be careful - you could be
wrong.

Question-Marked Squares
=======================
Also called Marked Squares, these are squares you have right-clicked
on twice. Marked Squares are squares which you are unsure of.