Game 4 in a sequence of 12.
In this forth game we make the bug move up the canvas.
This is animation. We repeatedly clear the canvas and then draw the bug in a new position.
If this is done quickly it looks as if the bug is moving.

To make your own copy this game use the 'File > Save Page As' feature in your browser.

To change the resulting file use a text editor such as Microsoft NotePad.

Go on to play Game 5.