Wall 2.2 Free

Press "Space" to reset the pen and return the cursor to (0,0)
Press "C" to clear the page
Press "M" to get the pen in position, only do this if you want a clean road as simply stopping and pressing the "Green Flag" will cause a jagged line to appear.
Once you're ready simply push the "Green Flag" and watch as this snail slow program builds a wall. Road. Same thing.