Ball Run using a flipper to launch the ball.
See YouTube video : https://youtu.be/LG5LbuRqiiI
This model requires a 11mm or 7/16inch ball bearing (not included).
Available from many places including:
https://www.amazon.co.uk/11mm-Chrome-Steel-Ball-Bearings/dp/B002SS16QY
https://www.amazon.com/Inch-Chrome-Steel-Ball-Bearings/dp/B01AX1MSKU
The author marked this model as their own original creation.