Zombie is a Racket program that changes the direction and orientation of a the zombie sprite when you click to the left or the right of the zombie.
If you do not have Dr. Racket installed then goto https://racket-lang.org/ and click the download button.
Alternatively you can view the definitions, or code, in the ZombieDefinitions.pdf
Click the mouse to the left or right of the zombie to make him turn towards the mouse click.
Use the space bar to reset the zombie back the start position.
Enjoy! :)