Hovering target shooting game
This is the orginal (of 3 styles) of this format (hovering plastic foam balls) $30 http://www.hammacher...Games&catid=226 Replacement balls are available from craft stores.
Note - when one ball is removed from the airstream, the pressure differntaial is altered for the other four, making the dynamics different. THAT happens each time a ball is removed from its column. This feature makes the game more challenging! Also, you can adjust the airflow manually before shooting, to make the balls at the start of shooting, float higher or lower above their respective air columns. I have owned this one for years. Love it. None of the three models is well suited for outdoor use.