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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…
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…
Puzzle Ninja Puzzles
The gift is a postcard with a few examples of a Japanese pencil-and-paper logic grid puzzle on it.
Money From Nothing: Or Why the Serial Number Now Appears Twice on Each Piece of Currency
Martin Gardner introduced me to Vanishing Area Paradox Puzzles in Aha! Gotcha! with the Vanishing Leprechaun Puzzle. He explained the paradox by describing an old counterfeiting method. I've learned the method and so I'm going to share it with you.…
Markus Götz Memorial Folding Puzzle
Folding puzzle designed by Markus Götz.
Knight Mazes
Knight mazes are a set of squares on a square lattice upon which a chess knight may move. We examine elements of mazes which can be both attractive and puzzling, and discuss two methods of creating mazes.
Kencils
“Kencils”, jumbo pencils with sample puzzle sheet
Horocycle Kit
A scissors and tape activity on a letter sized sheet of cardstock, for building a horocyclic model of the hyperbolic plane, with a postcard-sized memento of of our sculpture build attached.
Rainy Day Puzzle Postcards (with the Temporal Logic system called D)
Years ago, when I first learned of the Temporal Logic system called D, I made a puzzle postcard using the system and mailed copies to a few friends. They seemed to enjoy it, so I'm doing it again, for the Gift Exchange.
Martin Gardner Portrait Maze
Illustration and maze design by Elizabeth Carpenter.
Catalan Solid Net for further play
The included piece will be a decorated deltoidal icositetrahedron net, which can be colored and subsequently cut and assembled. Alternatively, those with a cutting machine can cut the closed regions on each face of the polyhedron to obtain an…