Not related to golf, but I made up a game for my younger brother and I to play on a tennis court when I was 12 years old or thereabouts that some of our Australian friends might find amusing. The tennis court by my house was surrounded by a 10' high chainlink fence divided into five sections at each end by vertical poles. We used an (American) football, and each of us stood at one end of the court, and we took turns trying to punt the ball into the fence at the opposite end without going over, with scoring the same as used in Aussie Rules football: six points for a goal kicked between the two center poles, one point for a "behind" kicked between the sections on either side of the center (or for a ball that went through the center after being tipped). If you stopped a point from being scored, you got to kick from wherever you caught or stopped the ball; otherwise, you kicked from against the fence at the back.
You could never play this game as an adult, but for young kids with poor leg strength, the tennis court was just the right size for us!
Cheers,
Darren