The link will take you to this game where you can control the green square using the arrow keys.

• The green square will be stopped by the red wall. The goal is to get the green square to touch the yellow square.
• There are several ways to accomplish this.

You can quickly view the source code with CTRL-U

• Click on game.js

There is a hidden function, dead code if you will, designed to toggle the wall on and off.

Find the ‘Developer Console’ within the web browser after hitting F12

• Type: toggleWall() and hit enter

Once you move the green square over the yellow square, the flag will be revealed

• Note: You could also programmatically change the X coordinate of the green square so that it overlaps with the yellowsquare with greenSquare.x = yellowSquare.x