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Cast Helix

4 out of 5 stars
$15.99 CAD Canadian Flag

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Product Information

ObjectRemove the ring.
DifficultyLevel 9 - Gruelling
TypesAkio Yamamoto, Hanayama Metal Puzzles
Dimensions2 1/2 in x 2 1/2 in x 1 2/3 in / 4.3 cm x 6.2 cm x 6.2 cm

Product Description

Note: Our level rating system is different than Hanayama's.  Hanayama's level 1 is equivalent to our level 5.... level 6 is equivalent to our level 10.

The grooves engraved in the two rotating boards are called "logarithmic spirals." These two grooves always cross at right angles, and a square hole is formed at their intersection. The goal of this puzzle is to remove the helix ring that goes through that hole. The inspiration of this puzzle is the morning glory. The puzzle was designed to look like a bud that comes into bloom with twining tendrils. The original concept dates back to 1990, but it has been enhanced with the addition of several tricky features. The theme of this puzzle is "Flower."

Designed by: Akio Yamamoto 2009

Customer Reviews |

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4 out of 5 stars
4 out of 5 stars

Disclaimer: These reviews are written by our customers. Puzzle Master makes every attempt to keep these posts informative and relevant. If you find a post objectionable or inappropriate, please let us know by sending an email to

4 out of 5 stars On Wednesday May 3rd Jorge wrote,
I love this puzzle because it is made to make you think you know how to solve it as soon as you start playing with it and the actual solution is really clever! I don't give it 5 stars just because the puzzle can get a bit stuck when the ring is coming off, but it's not too big of an issue
5 out of 5 stars On Friday April 1st luxige wrote,
Pretty neat! And nice looking to boot. A few reviewers mentioned need to use some force to make it work. They must be doing it wrong. The correct solution is elegant and effortless. The difficulty rating seems about right to me.
5 out of 5 stars On Monday May 19th Mtranda wrote,
loved doing this puzzle. my friend bought it, and spent 7 years trying to solve it, i got it in 7 minutes exact(we timed it too) gotta look at this one from a different perspective
5 out of 5 stars On Thursday April 5th Shaggy wrote,
This is one of my favourites! I had to observe it very well before I found some interesting part of it and then I tried to use it. And it worked! The cast is beautiful, too.
5 out of 5 stars On Sunday December 11th puldis wrote,
Took 2 hours to figure out the intended solve. You can brute force it, but the intended solve is actually very clever and oh so much more gratifying.
5 out of 5 stars On Friday January 21st john acord wrote,
This puzzle is unique and has a lot of personality, it is one of my favorites, but I haven't gotten it apart yet. I just like looking at it, and playing with it is fun.
3 out of 5 stars On Wednesday November 17th Pentti wrote,
Little bit of forcing in the end.
3 out of 5 stars On Saturday December 19th George wrote,
I must admit I'm a bit disappointed in this puzzle. After a half hour I got the ring off but my a little bit of force. I have now taken the ring on and off several times in two different ways and I think none of them are the intended solution, because they are rather easy and seem to use a little force at one point. Please add the solution to this puzzle as I am quite baffled at what the "correct" solution is.

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