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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
The Hat Flexagon
The hat flexagon, inspired by the recent discovery of the hat monotile
Tacorama Card Game
Printed Tacorama Card Game and mathematical exploration thereof
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…
Nested Fidget Square
A small telescoping toy that is both visually and tactilily satisfying to keep hands busy while the mind is otherwise occupied.
Paradise
Two wooden puzzles in one, made out of maple. Use all six pieces to form a standard die, with the numbers 1 to 6 and opposite sides adding to 7. Then, do it again in a completely different way.
Factored d15
“Factored d15” is a pair of dice, one with three sides and one with five. There are fifteen possible results from rolling the pair. Simple mental math can be used to assign the numbers 1-15 to the results, making the pair a fair virtual d15.
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…
Sliding Block Puzzle Page - Update
Play sliding block puzzles online, including the G4G Logo Puzzle
The Mathematics of the Game Turing Machine
In this paper I describe the game Turing Machine (https://turingmachine.info) and perform analysis on some optimal strategies. The game proceeds by asking a number of questions leading to deducing a hidden value like games such as Clue/Cluedo. One…
15 Mathemagics for G4G15 - In Between Magic and Topology
This paper presents 15 vignettes, each designed to evoke both mathematics and magic. We end with a super-generalization of the Chefalo Rope Trick and the insight that 15 = 3 x 5 = 1x1 + 1 x 1 + 2 x 2 + 3 x 3.
A Mathematical Hangman Game
Everyone knows the hangman game! Well here is its mathematical counterpart. The goal of this game is to guess the right number. However, there is a catch... You are not allowed to guess the digits. How can you win then? You have to ask your opponent…
Moscow Puzzle #196
Moscow Puzzle 196 requires that the puzzler build a gadget and then use the gadget to solve the puzzle. We are providing the gadget parts for you to build.
Introducing the MESMOID
The MESMOID is a right circular cylinder with an eccentric circle cut out of it. Because of its design, it can act like a rolling pendulum. Unlike a coin or wheel, when rolled it moves back and forth instead of in one direction only.
It is a…
It is a…
Solomon's Trinity
Solomon's Trinity is a game and puzzle played on a modified Star of David gameboard, including activities to be played with 15 game pieces. Recipients can add a nickel, dime, quarter, and 15 or more pennies as game pieces. Formal game pieces can be…
Cellular Auto-mons
Trading cards of cellular automata patterns. A QR code to an interactive site for viewing the pattern is planned to be included on the back
Cards for Word Games (Martin Gardner Related)
This set of 36 cards is for word-based games (e.g., Just One, 25 Words or Less, Password, Poetry for Neanderthals). The words on the cards come from the titles of Martin Gardner's Mathematical Games column in Scientific American and his Wikipedia…
Pickagram G4G Addition
Tangram inspired magnetized 3d art puzzle. You can find more info from www.pickagram.com
Can the Number of Pieces in a Rectangular Jigsaw Puzzle be a Multiple of the Number of Edge Pieces
This paper deals with the math associated with the number of edge pieces in rectangular jigsaw puzzles.
Math is Magic
My bgift is two puzzle postcards
Dragon Riders Puzzle Postcard
A postcard with a puzzle on it - how to make the two riders ride their dragons the right way up?
SPACE CHIPS DIE CUT & SPROING BALL
SPACE CHIPS DIE CUT & SPROING BALL
Martin Gardner Scrabblegram Bookmark
A bookmark featuring a tribute to Martin Gardner using each of the 100 Scrabble tiles exactly once.