Giant race car kumiki puzzle from OSK Kumiki. A twenty-five cent coin shown for scale.

Niko Raido building (or Nikoraido), a giant kumiki puzzle from OSK. There's a quarter coin in the foreground to give you an idea of the scale.

Five polyomino pieces fit into the tray. Coffin describes this design as more difficult than his others tray puzzles. Bottom of tray inscribed with "Christmas 2000", signed and dated by John Devost.

Gordian's Knot from Thinkfun - 6 board burr.Devil's Dice from World Wide Games (3 problems, with instructions).Tangrams, a plastic simulation of the ivory Chinese set.City Puzzle from Binary Arts (precursor to ThinkFun)Escape from Alcatraz, from MRM ProductsTotal weight 2 lbs 3 oz

This is George Miller's 3-D printed version of the Moby Maze, not the later version sold by Hanayama.George Miller's description: Moby Maze is probably the first maze built on a Moebius Strip. The Moebius strip is a circular band that has a one-half twist in it. This curiosity is a popular mathematical curiosity since the shape has only one side! This property is fully exploited in Oskar's design. You have to push the ring around twice to get it to the "other side". The solution is not too diffi...

Devil Puzzle by Nob and Koji, made by B&P (07-7334), light surface wear to pieces, with instructions.Bettle Sliding Puzzle, still in plastic wrap, B&P 07-6434. Designer Unknown

Robert Sandfield's "The Hangman's Puzzle". An unusual puzzle from IPP25. 

Three puzzles from Bits and Pieces: Coin Remove 07-7163: Most of you will recognize this classic design, but this has an added coin hidden in it. Doesn't add to the complexity.Double Cross 07-7082, with instructions.Three Horseshoe puzzle, metal. A nice, compact version with brass instead of steel.They all come with original packing and instructions.

Missing Notch, a Stuart Coffin design made by Fuller under his "Raleigh Puzzles" banner. I never solved it - it's tough! Obviously shipped disassembled.

This is a 9-piece burr with 4 sticks on one axis, 3 on another, and 2 on the last. I believe I bought this from Puzzlein in '04, their #145. The sticks are 3" long. I have no idea what level the puzzle is.

A metal hidden maze. The top and bottom of the disk rotate. There's a hole on the top and bottom for entry and exit for the ball (which is currently inside). I seem to have no instructions for this. 

A souvenir of the 24th International Puzzle Party, Tokyo. Object: Remove the key and put it back. In the 'locked' position all 4 tumblers block the key from being removed.

Superstrings, a 2 piece puzzle, designed by Richard Gain. It's a pretty tricky 2-piece puzzle. 

Disco Puzzle, from Mag-Nif, in original cellophane. Eight plastic pieces that have to be put together.

This is the same as the Hanayama puzzle of the same name, but came out well before the Hanayama version did. It's fairly rare, as far as I know. I bought it directly from Eldon Vaughn before he sold the rights to Hanayama. 

Made for sale on 6/8/2015, this is a fairly tricky cage puzzle with four burr pieces. Buyer pays postage. See Eric's Discontinued Gallery for more information. 

Eric's description: Stewart sent me several experimental prototypes a while back and this one really grabbed my interest. Mostly because it looked simple...pack six "lollipops" into a box. Plus I could already see them in the solved state! I dumped them out and mixed them up and then sat there, stumped. Eventually I figured it out but it took a lot longer than I expected. A very fun, tricky puzzle that can also form a bunch of other symmetrical shapes.Construction of this puzzle is outstanding. ...

Brian Menold's description: I haven’t made any of Tom’s designs for a while and while looking for ideas I was intrigued by the simplicity of this design! A simple box with 4 seemingly easy obstructions uniformly spaced around the interior and 4 rather straight forward pieces. I also had acquired a nice piece of spalted beech that I wanted to be able to use on a box to show off the grain and spalting. A few of the spalted beech pieces required a small amount of filling in some softer areas...

Terrific puzzle by Greg Benedetti beautifully realized in Wenge, Bubinga and Leopardwood by Eric Fuller. Buyer to pay postage.

Grip is a hidden maze designed by Tim Alkema. A single burr piece locked into the box by two cubes.  Fit and finish are beautiful.  I'm selling this puzzle to make room for future purchases. 48 puzzles were made for sale on 6/23/2016 and sold for $59 each.  This auction begins at $49!