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The Icosian Game
A game created by Sir William Rowan Hamilton. A traveler must visit 20 cities without revisiting any of them.
Penrose P3
I am making paper flexagons with Penrose patterns on them to illustrate the patterns. My stuff touches three things from Martin Gardner, Flexagons, Penrose Tiles, and Polyominos (the classification system for tetraflexagons is based on these with a…
Big Knot Variation
Burr puzzle designed by Oskar van Deventer (used with permission). For G4G14, this 14-piece puzzle felt appropriate. Contrary to the name of the puzzle, these exchange puzzles are in fact rather small.
Reversing Nesting Box Puzzle
The puzzle consists of two boxes, with lids, One box is white and the other is blue. Place the white box inside of the blue box and close the lid. Now open the blue box and remove the white box. Next place the blue box inside of the white box and…
Markus Götz Memorial Folding Puzzle
Folding puzzle designed by Markus Götz.
Marjorie Rice's "Versatile"
Two pages
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
(1) a description of how to construct Marjorie Rice's "versatile" together with six patches of copies of the tile that will fill the plane by translations.
(2) a sheet with 20 copies of the versatile to copy and cut out in order to…
Martin Gardner Portrait Maze
Illustration and maze design by Elizabeth Carpenter.
Free the Pearl
Applying the planar puzzle mechanism of the Magic Disc puzzle to a three-dimensional form yields an interesting and challenging coordinate motion puzzle.
Puzzle Menu
A puzzle hunt hidden inside an 8-page pamphlet.
A Torus Without Diagonals
Cut-and-fold a polyhedron with 7 vertices, 14 faces, 21 edges, and a hole through it like a doughnut. A cube has internal diagonals that connect the diametrically opposite corners. By contrast, this polyhedron has no internal diagonals. There are…
The Tax Man Problem
Bill Gosper shared this problem with me. He calls it the Tax Man Problem. In the province of Peculia Pecunia, you are paid on an annular basis. That is, you get a (unit radius) gold disk from whose center is punched a smaller disk which you donate to…
The Shifting Maze
A maze on a flexagon, where the faces keep getting rearranged, adding an additional challenge to finding your way through the maze.
The Spikey Sculpture Kit
Assemble a paper sculpture of the Wolfram logo, affectionately known as "The Spikey".
Sudoku Ripeto and Custom Sudoku Books
Sudoku Ripeto and Custom Sudoku are the first Sudoku variants with repeated numbers and letters (please visit www.customsudoku.com). As such, they require new solving tricks and techniques.
I am glad to offer an assortment of books featuring…
I am glad to offer an assortment of books featuring…
Sam Loyd Puzzles You Have Not Seen
In 1909, the Lyon Manufacturing Co. of Brooklyn, NY, published a small advertising booklet for Mexican Mustang Liniment. The booklet contained sixteen Sam Loyd puzzles, most signed with Loyd’s name. Most of the puzzles were duplicates or redrawn…
Puzzle Stickers
My contribution to the gift exchange is stickers hiding clues leading to a mathematical treasure hunt I'm hosting across my blog and a few other spots on the internet. I also have a physical prize for the first person to reach the end.
G4G13 Puzzle Cube
Three linked square bands with the G4G13 logo printed on some faces. Arrange the bands to form a cube with a logo on all 6 faces.
Does the Barber Shave Himself?
Bookmark with philosophiocal logic puzzle.
The Real Rubik's: A Visual Puzzle
My submission is an image featuring six cubes that all look like scrambled Rubik's cubes. But only one is. The other five all have some error impossible to find on a traditional cube. Can you suss out which it is and thereby find The Real Rubik's?
Chinese Tangram
It combines a deck of playing cards, tangram puzzle illustration, folk games (Chinese zodiac) in one set.
untitled (Tangle toy)
G4G Give-away
Linked Circles, Space Numbers and Space Logic
A single two sided heavy page detailing some research on linked circles, space numbers and space logic as a physical gift. In addition a downloaded paper on the same subjects with more details.
Space Chips
Space Chips are a versatile building toy. With the same chips you can build 3D shapes that are symmetrical, or you can build 3D characters that are expressive and creative.
Sculptural Martin Gardner
My contribution to the gift exchange is a 5 X 7 inch, four-color, tri-fold glossy card with photographed imagery of my 11 X 12 X 9 inch multifaceted-portrait-sculpture of Martin Gardner. My painted, kiln-fired, stained glass and…