(and I don't even see the possible connections to my clue anymore ).
Either we're all approaching the clue wrong, or I guess Wikipedia sorta failed many of us here as it didn't really provide a video showing a Pachinko machine in action, and somehow I didn't get anywhere good on YouTube either (seemed to have found more videos of how to setup/repair vintage machines with too much talking and not enough showing, maybe because they don't want to wear out their antiques
). One enthusiast's webpage (again, mostly on vintage machines) talked about how the ball gets shot up, going across ("along") in an arc and then fall down into the "main area" with the pins, so with that in mind I really thought Simon's answer might be it.
Then geoo talked about Fun 3 as a good example without the inversion, so I started looking for levels where the entrances are low, the exit is high, and the position between the two are close to vertical (as opposed to more diagonally upwards like Taxing 3). Taxing 4 fits the bill for me better than Taxing 23 (plus the latter has a repeat that the clue doesn't seem to disambiguate). True, the pins part of Pinchinko is a little hard to argue for in Taxing 4, it is a rough guess after all.
Steve's guess sounds pretty good too, let's see if it pans out better the rest of ours.