A multi-challenge puzzle presented by Bill Cutler at the IPP28 in Prague Czech Republic.Very fun, hard and rare.

IPP32 design competition entry by Tom LenschArrange the nested cubes with lids so that they fit inside the largest box with the fixed brass rod. Each cube must be oriented so that the rod goes through one of its three holes.

Andreas' exchange at IPP38.  Assemble the snake of spheres into an octahedron

This puzzle was Henry Strout's exchange puzzle at IPP 29 in San Francisco. To solve the puzzle, all the pieces must be put in the box. Easy enough, except for two things. One, they must all go thorugh the 1x2 slot in the side, making the order of insertion quite important. Two, the yellowheart piece is stuck inside the box, so you have to plan around that. Quite tricky!

IPP28 Puzzle of the Year award winner.This is a real gem of a puzzle amongst solvers and collectors. A wonderful A-ha moment when you are able to slot the three blocks into the box. Requires out of the box thinking (no pun intended)For more info, check out the link - http://smallpuzzlecollection.blogspot.com/2014/04/odd-puzzle.htmlPLEASE NOTE - Winning bidder will be invoiced the total of the winning bid amount PLUS shipping cost (registered mail with tracking) to be calculated AFTER THE ENDÂ...

ISQ CRATECAN YOU DO IT?A Unique Puzzle made by Bits and Pieces.This Piece is New, in Box, opened just for Photos.Original Instructions tucked in Center as shipped.A Tricky Metal Puzzle, held by Magnets, to assemble.Please note this is a commercially made cast piece, and there are surface blemishes and minor pits as a result of original fabrication. They can be seen in Photos.

The Birthday PuzzleThe set of twelve pentominoes, a tray with grid of numbers, instructions in multiple languages, a 3.5" diskette with solutions, and the original packaging (plastic packaging top has crack).A new challenge for everyday of the year.  Goal: Place the pentominoes in the tray leaving numbers exposed to today's date.  Or just use as a nice set of wooden 3D pentominoes and a collectible computer artifact from years ago. 

This tile matching puzzle consists of 8 domino-shaped pieces and a plastic tray to hold them.Made in Taiwan.

Double Octagon Inlay Puzzle Box  by  Jean Claude Constantin.Sold by Bits and PiecesDescription from Brian Fletcher:http://mechanical-puzzles.blogspot.com/2010/12/bits-and-pieces-puzzle-boxes-part-4.htmlThat brings us to the final box of this batch, The Double Octagon Puzzle Box by Jean Claude Constantin. Unlike most puzzle boxes where the challenge is to open the box, the challenge of this one is to put it back together once you've opened it.The metal screw on the top unscrews, the top lifts ...

This puzzle designed by Stewart Coffin is comprised of polyhexes composed of three or four joined hexagons. The sturdy foam rubber is easy to work with and there are two sets: one blue and one pink, each in it's own tray. A booklet is included with numerous challenges involving these shapes and their solutions. Copyright 1993 by Binary Arts Corp.

Cubi 12 is a really tough packing puzzle which had me scratching my head for quite a few nights. Just 4 pieces to pack into the box, but of course the restrictions make it very difficult!Will combine shipping. Shipping costs and handling fees (4.5%) will be calculated at the end of the auction. I accept Paypal and Transferwise.

JABS (Just Another Broken Soma), Presented in Moabi and Zircote by Wood Wonders. From their product description:"Well, Ken is at it again. If you liked Broken Soma, I think you'll enjoy Jabs! Although, I think, Jabs is a bit easier than Broken Soma, that may be a good thing. If as I did, you struggled with Broken Soma for what seemed like far too long! Like the Broken Soma, Ken has split the three voxel piece into six half cubes. Now it's up to you to find the one solution to this clev...

https://www.pelikanpuzzles.eu/detail/triple-3/This is another wonderful packing puzzle from Osanori Yamamoto. Borrowing from Kevin Sadler:“The pieces of Triple 3 leave quite a bit of space inside with the limitation of placement being provided by the large front hole and single cubie hole diagonally opposite. This required a different approach to me from the Triangle Ring 3 with placement of the specially shaped piece first and working out how to add pieces around it. A much tougher ...

https://www.pelikanpuzzles.eu/detail/triple-3/This is another wonderful packing puzzle from Osanori Yamamoto. Borrowing from Kevin Sadler:“My copy of Tulip 1 is made from a vibrant red Padauk and contrasting Wenge. The name seems to allude to the shape of the opening in the box. At first glance, it appears like a standard 2x2x2 shaped gap but after a moment of play with the puzzle, it rapidly becomes clear that the opening is severely restricted by a diagonal segment covering 2 of th...

Rombol version of this puzzle; well crafted and packs smoothly.6 "coins" must be loaded into a box (the "machine") so that none stick out the top. A demanding packing problem with only one solution.  Uses spatial awareness in order to solve it.A brilliant puzzle, The Puzzle of the Year (Jury Grand Prize and Puzzlers' Award) at IPP 2018.I accept PayPal. Buyer can expect to pay $13 shipping domestic within the US and approximately $35 internationally. Happy to combine shipping on multiple...

Ken Irvines beast "Broken Soma" was talk of the town when introduced to the world. Truly an incredible aha moment and a puzzle you could easily resolve after some time on the shelf looking insanely beautiful like all of Brians work. 

It is purge time for fivesinatras - I have to let go of some puzzles to free up some space (and recoup some funds); my collection is focused on take-aparts, so I am listing some excellent limited release puzzles from other puzzle categories.This packing puzzle looks simple but it is anything but! Fit 7 blocks into a box with a partially restricted opening.For more read: 

Three challenging challenges are on offer as you try to visit 5 sites in Washington by making loops that utilise 0, 1 and 2 bridges.Offers welcome.

This is a very rare Pavel Curtis exchange puzzle from 19 years ago at the IPP22. There are numerous hints and solutions included.The puzzle is duel sided with 2 challenges.A4 paper sized.Originally there was a framed piece to help hold some pieces in place. The absence of this does not affect the solve or puzzle in any way.

Eric's description: X Cage is a brilliant new design that will surely drive you mad. Five simple pieces fit into an attractive cage through the opening in the acrylic. The solver quicky realizes that there simply isn't enough room to accomplish this...to find the solution you'll have to make a discovery!Construction of this puzzle is outstanding, with a very precise fit.47 copies made for sale, each signed and dated.