Puzzle design by James Ferguson, object design by Peter Knoppers and Oskar, made by Buttonius Puzzles & Plastics. From the attached instructions, "Henry Dudeney presented this 'Mechanical Paradox' and its solution in Modern Puzzles (1926).""This remarkable device was contrived by James Ferguson in 1751 as a challenge to a sceptical watchmaker during a metaphysical controversy. 'Suppose', Ferguson said, 'I make one wheel as thick as 3 others and cut teeth in them all, and then put the three w...

Aim is to open the egg Based on Issac Newton's 3 Laws of motion, think about it IPP bound,get it before they do Wood is aromatic Huon Pine, Best of the Best Comes with stand Buyer to pay 4% Paypal and Postage

Cube The Square, designed by Trevor Wood and crafted by Walter Hoppe. The eight octominoes make a square and a cube. Both solutions are unique. Eight pieces plus the tray, crafted in cherry wood.

This personal copy has a unique three color scheme that was unavailable on the website. This is a fantastic puzzle design. I wish I had made more copies of it! With a staggering 10,800 solutions and only 4 constructable, it is decievingly difficult to solve...it's easy to get all but one piece together, but that last piece is the trick! It is a very fun puzzle to solve and displays very nicely because of the interesting joinery on the edges. Crafting this puzzle was a challenge, which...

I've been hoarding this beautiful puzzle since it was entered in the IPP design competition. This was Jose's first design, and is a VERY well made and interesting puzzle. Shipping cost will be calculated after the end of the auction. Winning bidder will pay the actual postage amount plus $3 for the first item and $1 for each additional item to pay for packaging costs. Please add 3.5% for paypal payment.

This is the SEARious Burr: a 13 piece burr with a secret lock. There are no gravity pins or magnets. It takes 13 moves to unlock the secret internal mechanism. The puzzle is in excellent condition.

The excellent money bank from Akio Kamei. Original work, fairly tricky. Mechanism tested and works properly. Shipping cost will be calculated after the end of the auction. Winning bidder will pay the actual postage amount plus $3 for the first item and $1 for each additional item to pay for packaging costs. Please add 3.5% for paypal payment.

6-pieces fit together into two layers. very tricky. comes without traybuyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable

6-pieces burr with an unusual result shape... buyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable

a really nice but not too hard 3-piece board burr from Oskar van Deventer... Beautifully made by Tom Lenschbuyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable

this beautiful 6-piece puzzle assembles along one axis and is serially interlocking amonst the halves of thepuzzle. Very difficult.buyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable

this is simple rhombic-dodecahedral box designed by Akio Kamei, very similar to Bill Cutler'sCrooked Box... Comes apart on one axis...buyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable

from cubicdissection.comWith an earlier appearance in water cut plywood by Maati Linkola as his IPP24 exchange puzzle, Squarrel is very typical of an RKB design. Six extremely simple looking pieces interlock with a single, high level unique solution to form a very creative and unconventional puzzle shape. The efficiency and creativity of Ry's designs make them a joy to produce and offer to the puzzle community! buyer is responsible for all shipping expenses and money transfer fees (includ...

A Drive Down Lombard Street, 2009 Exchange puzzle at IPP29. A very well-made puzzle from Brian Young of Mr. Puzzle, the object is to guide a marble through a maze that has sliding pieces moved by gravity (tilting the box) which make up the marble's path. Not only do you have to pay attention to the ball falling down into the lower level (thus making you start over), but you have to slide the bits around to give the ball an erratic path toward the goal. Fun, but one more puzzle that I have to giv...

The object of this puzzle is to remove the lock

8-piece interlocking block puzzle; signed, numbered, and dated.

This is the One Piece Packing Puzzle, designed by Simon Nightingale and crafted by Eric Fuller. The goal is to get the cube to stay put in the box, and then, to take it back out. The puzzle is in excellent condition.

This 1971 puzzle / game from Parker Brothers includes 15 games for 2-4 players and 7 solitaire puzzles. The large, plastic board has pieces in one of four colors that are put into slots, with four slots per wheel, but wheels overlap so each piece is a part of two circles; turn one circle and it changes the color in the other circle, "Rubik" style. The wheels neatly click into place. <p>Some of the games and solitaire puzzles include The Herdsman Puzzle, Binary Star Puzzles, Orbit Solita...

from Jaap's Puzzle PageLuminations is an electronic puzzle in the shape of a tetrahedron, made by Random House in 1989. It has three coloured lights (red/green/yellow) at each of the four corners. There are 5 playing levels. Which level will be played depends on which corner is pointing up when the puzzle is switched on, and level 5 is only accessible when level 4 has been solved. When playing the game the corners will show various colours, and they change (depending on the level) when you rotat...

pieces make either 3x3x3 cube + 4x4x4 cube + 5x5x5 cube, or they all assemble to make a 6x6x6 cubecomes with plastic box which has tears in in.buyer is responsible for all shipping expenses and money transfer fees (including paypal) if applicable