...Is similar to ball golf or disc golf. Your "Driver" is a very hard, round, and heavy footbag. You boot it from the tee box towards the green. From there, you use a softer and softer bag as you get closer to the hole. Your putter would be a very soft footbag that doesn't roll. If you're outside the green (20 feet from the hole or 6m) you can roll your footbag into the base of the hole and it counts as being in. Once you're on the green your putt has to land in the hole to count.
There are a lot more rules and skill to this game than one might think.