Pachinko is Wil Strijbos’s massive metal masterpiece, regarded by many to be the premier sequential discovery puzzle. Inspired by Japanese pachinko machines, the puzzle has some unusual distinctive delightful steps.
You can see some wonderful writeups of the puzzle at:
https://www.puzzlemad.co.uk/2016/06/pachinko-box-beautiful-discovery.html
https://www.boxesandbooze.com/boxesandbooze/2016/07/jackpot.html
From the description:
Challenges:
1) Free the First Coin, while the box is still closed...
2) Open the box...
3) Free the Second Coin
Instructions: Please don't use any force! Just turn things over, slide things back and forth carefully, change positions etc. No "external tools" are required. Always play over a clean table (there's a good reason!). No Banging, No Rotational Moves, and No Force Required at all! (I mean it!)
Condition: Perfect
Materials: Metal
Buyer to pay shipping, calculated after auction. Insurance is optional, to be paid by buyer. Please wait for the updated invoice before making payment. Payment via PayPal FF or PayPal GS + 6% please.