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Echidnahedron Puzzle
This is a 12-piece puzzle assembling to form the final stellation of the regular icosahedron, a spiky shape also known as the echidnahedron.
Chirality of Flexagons
A chiral flexagons with a secret message
15^2-rep-tile of F polyomino
I provide 15^2-rep-tile in new packing found in 2022. They are made by MDF and acrylic.
Lizard Tile
Martin Gardner was fascinated by tessellations, as am I. This year I have decided to share a 3D printed model of a fun math tile that we have been using in our Math Carnivals in the Republic of Panama, organized by the Panamanian Foundation for the…
Spectre Circle
26 piece jigsaw puzzle called Spectre Circle. It can tessellate a plane and not repeat any pattern
Inspiration Cloth
Microfiber cloth (6" x 7") Useful and Inspirational Microfiber cloth (blue front, gray background with red and orange depiction of the Coronavirus).
Blachman-Nancy-GiftExchange-InspirationCloth-G4G15 1-29-2024 Please use the most recent PDF and not…
Blachman-Nancy-GiftExchange-InspirationCloth-G4G15 1-29-2024 Please use the most recent PDF and not…
Infinity Cube
A very small infinity cube with acrylic 2-way mirrors on the inside, with a hole for inserting a light source. Comes as a kit: 6 laser cut squares with finger joints and a small keychain light.
Sixties Sculpture
This will be a make it yourself sculpture kit.
Martin Gardner Randomly Generated Celtic Knot
This is a physical item, but the item is a piece of paper. My Celtic knot generator will create 200 unique randomly generated knots, that all spell out Martin Gardner's name. I will provide a printout of the rendered knot and the instructions on how…
Martin Gardner and The Puzzle Cabaret
Paper and pencil puzzles with Martin Gardner as a theme.
Zone Proxima presents Early Childhood Math: Ages 4.5 - 6.5
The physical gift bag Zone Proxima Math flier title: Zone Proxima presents Early Childhood Math: Ages 4.5 - 6.5
In the spirit of G4G, Zone Proxima offers the opportunity for adults (parents, caregivers, educators, and philanthropists) to improve…
In the spirit of G4G, Zone Proxima offers the opportunity for adults (parents, caregivers, educators, and philanthropists) to improve…
The Trolley Puzzles
A little puzzle hunt with a philosophical theme
G4G15 2024 Thermometer Sudokus
The gift contains a Thermometer Sudoku and a Thermometer Killer Sudoku with G4G15 2024 theme. Together with the sudokus, there are links that allow you to solve online. Additionally, you can find replay links that show the intended logical solving…
Buttonhole Puzzle
Small stick with loop of string through one end. Small enough to fit in a snack size Ziploc baggie with an information card.
Beware the Ideas of Math
It is a long G4G tradition that for G4GX that there are two speakers, one of which extols the number X and one which cast aspersions on X. This the latter effort.
Elevating Tessellations into Three Dimensions: Approximating Geodesic Domes
Elevating tessellations to act as nets for geodesic domes have many applications in structural engineering, math, and synthetic biology. In this paper I describe a net and a 3D version of a heptagon-containing polyhedra, as well as sphericity…
Ten O'Clock
A Variant Sudoku
The Hat Flexagon
The hat flexagon, inspired by the recent discovery of the hat monotile
Creation of Seamless Symmetric Patterns
Computer simulation of complex dynamical system is used to create seamless symmetric patterns
A Fifteen Fun Properties of Jeu de Taquin
The French name for the Fifteen Puzzle is "Jeu de Taquin". The generalization by Schützenberger to Young tableaux has many amazing properties, and important applications in combinatorics, representation theory and algebraic geometry.
Digits of Pi DVD
A DVD of the 3 m 14 s long film Digits of Pi
Tacorama Card Game
Printed Tacorama Card Game and mathematical exploration thereof
3d Printed Hexaflexagon
A simple flexagon that's a great pocket fidget toy too.
With permission from designer: whpthomas at thingiverse.com
With permission from designer: whpthomas at thingiverse.com
A Version of the 15 Puzzle
One version of the famous 15 Puzzle (on which the G4G15 logo is based), that Martin Gardner described on the pages of Scientific American (1957).
Circo Mathematico Deck of Cards
For it's decade of existence the Circo Matemático (mathematical circus), a autonome group of popularisers of mathematics part of the Ludus Association, designed a deck of cards.
The poker-sized cards (63x88 mm) are COPAG 310 quality, slimline, with…
The poker-sized cards (63x88 mm) are COPAG 310 quality, slimline, with…