this post was submitted on 20 Apr 2026
117 points (97.6% liked)

What is this thing?

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Let us help you identify that mysterious object youโ€™ve found.

Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.

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a friend gave it to me ยฑ15 years ago. He thought it was impossible to get the ring out. Maybe it's faulty and they cut the rope shorter than they should have.

We don't know what this is ๐Ÿคท

a baby toy?

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[โ€“] TabbsTheBat@pawb.social 77 points 2 weeks ago

https://www.puzzlemaster.ca/solutions/1717-3d-string-puzzle-model-y

Ring and rope puzzle. Tons of models of these, though this one apparently has a pretty high difficulty rating

[โ€“] bjoern_tantau@swg-empire.de 39 points 2 weeks ago (1 children)

Knowing these you'll probably have to thread the ring through the slit at least once.

I bet the real trouble will be once you solve it remembering how you did it and getting the ring back on.

[โ€“] zout@fedia.io 3 points 2 weeks ago

Not just the ring, also the disc.

~~Edit: I'm not good at visualising, but it looks like mive the ring to the left over the slit, put the disc through the slit and then move the ring back.~~

Second edit: probably not.

[โ€“] postman@literature.cafe 28 points 2 weeks ago* (last edited 2 weeks ago)

Disentanglement Puzzle

Disentanglement or Tavern Puzzle

[โ€“] neidu3@sh.itjust.works 15 points 2 weeks ago

Yes, it's a puzzle. The aim is to get the ring off. Had one very similar at home when I grew up.

[โ€“] Gladaed@feddit.org 12 points 2 weeks ago* (last edited 2 weeks ago) (2 children)

The trick to knots is that only two kinds of them exist in 2D. The knot that is a knot and the one that isn't. To transform any knot into not a knot you only need to cross the rope through itself once. Ie cut and splice.

If you want I can give you abstract tips. But I think my hint was already close to telling you the solution.

[โ€“] albbi@piefed.ca 8 points 2 weeks ago (1 children)
[โ€“] Etterra@discuss.online 5 points 2 weeks ago

Insanity it is then.

[โ€“] b34k@lemmy.world 9 points 2 weeks ago

Looks like a topological untangling puzzle.

I've got a similar one, maybe the same puzzle, that's on my desk. I've not figured it out yet.

[โ€“] JelleWho@lemmy.world 7 points 2 weeks ago

The rope does not go though the ring. This ring is loose, yes it's a puzzle

[โ€“] DarrinBrunner@lemmy.world 6 points 2 weeks ago (1 children)
[โ€“] merde@sh.itjust.works 4 points 2 weeks ago (1 children)

you can spoil it. i'm tired of this thing

[โ€“] msfroh@lemmy.ca 5 points 2 weeks ago

Usually the "trick" is the fact that the ring fits through the hole.

[โ€“] A_Drusas@lemmy.world 6 points 2 weeks ago (1 children)

I am jealous of your tatami mat possession.

[โ€“] merde@sh.itjust.works 3 points 2 weeks ago (1 children)
[โ€“] A_Drusas@lemmy.world 2 points 1 week ago

I think I will always fondly remember the first time I was living in Japan and I accidentally knocked a salt shaker over, right onto the floor. And I just had no idea how to get a bunch of salt out of a tatami mat. Fortunately, it didn't really matter, because it was salt, and I just left it there.

[โ€“] StillAlive@piefed.world 5 points 2 weeks ago

First one looks kinky ๐Ÿ‘€

[โ€“] glimse@lemmy.world 3 points 2 weeks ago

I tangled a puzzle from this line, forgot to fix it, and found it 20 years later. Still haven't untangled it