Quoted from Nelly:swinks It would be really cool if you could come up with a way for that wave to rotate into position (much like a wave would develop naturally). Not sure what all you have planned for it but you could have the shot award more points if you "catch" the wave when its in position. Just spit-balling here.
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Maybe sequenced solenoids or better still a rotating cam shaft.
An opto the ball can obstruct " in the tube " to detect if you made it.