MowerJo is a programmable lawn mowing guy.  You can program him to perform a variety of tasks.  For example you can program him to cut the perimeter of the lawn or the entire lawn.  You can make the cutting more challenging by adding lawn gnomes.   Just make sure that you don't run into the gnomes.

In order to get MowerJo to cut the grass you need to give him commands.  You type these commands in the code window.  For example you can get MowerJo to step forward by typing move().  You can type multiple commands; just put them on different lines.  After you load the commands and initialize the grid you can execute your commands. Every time that you click the button, the commands are executed. 

When you program MowerJo, you can set his initial direction (North, South, East, or West) and his location (x and y).  His x-location is measured from the left of the screen. His y-location is measured from the top of the screen.