Hop Scotch- You will need some chaulk and a decent size side walk.
Rules- you can draw any pattern with one or two squares on a side walk. If you have one square in front of you you can only use one foot in that square if you have two you can use both your feet for those squares. you can only have one foot per square at a time. you hop from one end to the other, which sounds easy but it can prove to be harder than you would expect.
