Flicking - What you want to do here is to set the tip of your thumb just behind the marble. "Bend your forefinger so that its first joint rests on the first thumb joint. Now flick your forefinger forward so that it strikes the marble. This method launches your marble fast and hard." This is just one way to play/use a marble.
This is another cache that is close to a nice small tributary. Not hard to find by any means. This PnG is just one of many in the MM series. So continue on with the MM series to learn more idioms, facts, games and history about marbles.