This 25 piece puzzle utilizes 4 pin mazes on the key piece along with four moving pin pieces to create a 4 bit binary numerical sequence (not gray code). Other Binary puzzles use Gray Code where only one piece moves at a time for each step, with Binary sometimes multiple pieces need to move for a step. 45 moves to remove the key piece. It was entered into the IPP35 Design Competition. Only 7 were made. A neat design but due to too many time consuming machine setups these will not be made a...

Excalibur, designed and made by Pentangle in 1987.Made as a Christmas puzzle for the company 'ICI'.The objective is to remove the nice metal paper knife from the wooden block it is held by.On Jun. 10, 2016 02:11:17, the following description has been added:Comes with original paperwork and solution booklet.

6 piece cube, minus corners, by Vinco. Nice condition, good fit, with instruction sheet. Puzzle weighs 7 oz with packing. Postage outside the US is $13.50 on this, a bit less for Canada.

Cubic Burr, design Tom Jolly, made by Tim Udall. Fit is loose. Level 6.9. Wood is red meranti. Weight is 15 oz with packaging, so shipping outside the US is $22.50, less for Canada.

Cubic Burr II, design Tom Jolly, made by Eric Fuller. Level 5.8.8 (orthogonal... I found that there is a rotation you can make on the second/third pieces that reduces the move-count to, I believe, a 5.7.1). Weight is 12 oz with packaging, so shipping outside the US is $22.50, less for Canada.

These 2 metal disentanglement puzzles were sold by Target stores in 2002. These are shown as "Ring and U on Twist" and "Loops" on Rob's Puzzle Page. Weight is 12 oz with packaging. Shipping outside the US, from 9 oz up to 2 lb, is $22.50, less for Canada.

Double Cross, by William Waite. A beautifully made tray puzzle with 6 pieces. Weighs 10 oz with packaging; shipping outside the US is $22.50 for 9 oz to 2 lb.

The Great Escape, by Simon Nightingale. This was an exchange puzzle from IPP29, made out of corian. Put 4 balls in, then try to get them out again. Weighs 12 oz with packaging, so shipping outside the US is $22.50 (for 9oz to 2 lb).

Akio Kamei's Karakuri Club Christmas present for 2015

Hiroshi Iwahara's Karakuri Club Christmas present for 2015

Put 4 pieces of wooden cheese in a frame

Put 4 pieces in a tray.

Pack the 6 pieces in a cubic shape

I got this Revomaze new and never solved it so the original certificate should still be inside.From the Revomaze website:Crafted from anodised aluminium and nickel plated brass, this is the original classic of the Revomaze family. Don’t be fooled by that, with a solve time of around 5 hours, this puzzle can be very challenging. The V1 Blue is designed to help develop your mazing skills, the core contains a static progression maze you can neither see nor touch. You will need to use the power o...

"This ingenious burr was designed by Junichi in May 2007 with "head and hands; no computer". Junichi had the idea for a multiple rotational movement but did not get to finally apply it to a puzzle until he came up with the Tornado Burr.People often ask puzzle designers "What was going on in your head to design this puzzle?" What was going on in Junichi's head when he designed the Tornado Burr? Visualising things going up and down and back and forth at the same time is one thing, but things going...

This 3x3 with planks and cubes may look familiar, but it's got some tricks up it's sleeve. I dont want to give too much away, but generally everything proceeds as normal up to a point...then some serious oddity occurs (NO force required!) With several congruant pieces, you'll solve it the first time to get it all back together, then probably a couple more searching for the piece placement which yields a symmetrical grain pattern.Made with air dried walnut and various species, each puzzle is uniq...

This clever puzzle shows major design chops. Using four identical, simple pieces and a cage, Yamamoto created a level 9.2.5 beauty with only one solution. Fun to solve, a nice half hour challenge for the serious puzzler. The top and bottom is made from mitred Bubinga component pieces, replete with clever notching to facilitate the inset cross braces. A fine cage if I do say so myself.> Each piece signed and dated; ~30 copies made for sale. Ships assembled.

Like William Hu's "Simultaneous Maze" puzzle , Tamás had made a sequel using two mazes and one pin. Vanyó's design uses an identical top and bottom plate to confuse and trick the solver.An excellent addition to your collection, and a must have to compliment the Simultaneous design.The cage connectors are shouldered and reinforced by lateral connectors. The sliding internal pin has a pair of magnets which keep the slider centered once the puzzle is solved, a nice detail which keeps the puzzle f...

Elena's Burr by Aleksandr Leontev and made by Eric Fuller. Somehow, I accidentally bought two of these, so this is the spare. My starting price is a bit less than Eric was selling it for ($49). It's a very nice puzzle, but I don't need two of them. Weight is 10 oz with packaging, so shipping outside the US is $22.50, less for Canada.

The Goal of the puzzle is to remove the ring.The solution is connected with the design appearance so its a nice hint to find slowly what to do. This puzzle Won the 1st prize in the International Puzzle Competition 2011 IPP31 in Berlin