A perfect gift for our son-in-law who is a Mechanical Engineer. Great packaging and shipped quickly. Thanks!

Really well made. Looking forward to solving it.

Beautiful, well-made, and slightly infuriating. Just as a good puzzle should be!

Got it as a gift for my girlfriend and didn't expect her to love this puzzle so much! This puzzle has a very luxurious feel and it's very sophisticated and unusual. The only bummer is that these puzzles are expensive but well worth it.

This little box arrived before its delivery date, was made much better than I expected,and ended up being a perfect gift! The difficulty level was only a 2/5 but I struggled for a good half hour! I’m thrilled with this item and plan to order more. Oh ! And the customer service is second to none!

My son started collecting those snake cubes, and he is absolutely obsessed with them now. He takes his cube with him everywhere :) I love it because it's made out of natural wood and his brain is actually solving a puzzle, not just moving his hand like a fidget toy.

Love all of these puzzles so much I ordered more already!

I’m loving all these puzzles, I can’t stop fiddling with them. Also have ordered 3 times already lmao

Excellent quality puzzles & unique designs. Very challenging & fun👍

I want to suggest that it would be great if you guys can make a version with a similar shape but with fewer pieces.

They say this is the hardest level and I can confirm that my son who loves brain teasers, is absolutely stumped. The puzzles are high quality and have a great feel in hand. I hope my son doesn't get too frustrated because we still have four more boxes to go. We signed up for the 6 month subscription and highly recommend it to any children who like my son love to solve everything.

I like this puzzle a lot! The puzzle mechanism make sense once you complete the puzzle.

If you enjoy mental challenges, I highly recommend this subscription. I don't usually write reviews but I found this experience to be exciting and mind-blowing. I definitely recommend checking it out.

Great piece! I bought it as a gift to my husband. Very heavy, great quality and nice looking puzzle. My husband is still working on solving the puzzle.

The Notch is a true classic burr puzzle. At first, I was having a hard time putting all the pieces back together. I actually found alternate solutions to the intended ones, so I suppose there are many ways to assemble each version. I would recommend this puzzle to experienced puzzlers, as it involves a lot of thinking.