This has been a a hit with our kids (& the adults!) this summer. A nice quick and simple make that has resulted in hours of fun.
We used a branch from a birch tree and cut it into five equal pieces approx 6 inches high. Used a marker to number them one to five. The first two have large hooks, the third a medium sized U Fence nail, and the final two smaller U Fence nails. I selection rummaged from the shed.
We attached a a piece of cord to a sturdy but thinner branch and attached a hook made from an old tent peg to the end.
Place two boards on the ground and hook the logs from one board to the other. This can be timed or scored using the numbers marked on them.