Browse Items (136 total)
Sort by:
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.
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
Sixties Sculpture
This will be a make it yourself sculpture kit.
Martin Gardner and The Puzzle Cabaret
Paper and pencil puzzles with Martin Gardner as a theme.
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.
Ten O'Clock
A Variant Sudoku
The Hat Flexagon
The hat flexagon, inspired by the recent discovery of the hat monotile
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.
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…
How to Shorten Waiting Lines
The book chapter on which my presentation at the conference will be based.
Puclow, the Last Substitution Cipher
Substitution ciphers are completely obsolete, but maybe there's a cipher or two to find that can still be interesting to us?
Bucolic Cube
3 identical pieces (except for color) that can be put together to form a 3cm cube. A surprisingly difficult puzzle designed by Yasuhiro Hashimoto.
Path Puzzles
A collection of very entertaining puzzles.
3and3
This physical exchange puzzle includes a hexagonal frame, along with three triangles and three squares that are to be fit inside the frame. NOTE: this puzzle was intended for exchange in 2020, but is included now because I was unable to attend until…
Coffee Stirrer Structures and HyperTiles
Easy and inexpensive geometric frames (of truncated cubes or dodecahedra, for example) can be constructed from coffee stirrers and twist ties. These can be used to hang from the ceiling or to dip in soapy water. When one such frame, tetrahedral in…
Digit Dots
A booklet of bespoke, colorful, visually represented math puzzles.
Puzzle Food: More Food for Thought
At G4G8 I presented a menu of puzzle food. The menu has almost doubled. Time for a menu update!
Parity Triangle Card from the OEIS
Inspired by the fact that coloring Pascal's Triangle based on the parity of the entry results in a Sierpiński triangle-like fractal, each Parity Triangle Card illustrates a distinct two-dimensional sequence in the OEIS and is drawn using a pen…