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No one has mentioned GBC yet (Great Ball Contraption). GBC is a great hobby for adults, especially if you have kids. Bricklink is indispensable to find parts for GBC.

Here are some GBC examples:

https://www.youtube.com/watch?v=rWd3vgLaA_M

https://www.youtube.com/watch?v=A9_b6PzrqyQ

https://www.youtube.com/watch?v=tpBa59oOjVc

https://www.youtube.com/watch?v=1XqnTFSPG1I

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That reminds me of Capsela for some reason: https://www.google.com/search?q=capsela&tbm=isch

When my son was younger - about 7 years ago - I got really into making GBC contraptions with him. The hardest bits to find were the damn Lego balls! I paid someone on eBay $1 per ball for only 20 of them, not including shipping. I have no idea if it's better now, but I'm always amazed at the numbers of Lego balls the GBC events have. Where did they get them all??

That’s about right for the price. They’re not cheap. There’s copies that do the same job, but like in any hobby, people look down on the “fakes” despite them being functionally the same thing.

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