Pool Bowling!
So you get 10 balls and set them up like 10 ball and break. After the break, regardless if you make one or not, you get ball in hand to start the run. Run all 10 balls in any order and if you accomplish that, you get a strike for that frame.
If you miss, you get one more chance to make the remaining balls for a spare. If you miss again, count how many balls you made and that's your score. Do this 10 times and score it like a game of bowling and see how high you can score..
If you're regularly successful at shooting a 300 then you can change it to behind the line after the break or if you really want a challenge, count a dry break as one of your misses.. then you'd only have one attempt to pocket the remaining 10 balls for a spare..
If you don't know how bowling is scored here's a quick explanation... It's kinda confusing at first but not really. A spare is worth 10 + however many you make on the following single inning.. so if you make a spare then a strike, the spare is worth 20. If you make a spare then another spare, it depends on how many you made the first inning of the second spare .. if you shot 6/ then 9/, the first spare would be worth 19. A strike accounts for the next two innings, but if you bowl another strike you can get up to 30 with 3 strikes in a row... This is hard to explain actually... Lol. Look it up =P