3.1: The Lights Out Game

To show you how to use Pharo’s programming tools, we will build a simple game called Lights Out. The game board consists of a rectangular array of light yellow cells. When you click on one of the cells, the four surrounding cells turn blue. Click again, and they toggle back to light yellow. The object of the game is to turn blue as many cells as possible.

Lights Out is made up of two kinds of objects: the game board itself, and 100 individual cell objects. The Pharo code to implement the game will contain two classes: one for the game and one for the cells. We will now show you how to define these classes using the Pharo programming tools.

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