**Puzzles & Games**

### Play Solo or with Friends!

## Stacks Game

Be the first player to move all pieces across and off the board to win this 2-player strategy game. Decide between defensive and offensive strategy as you choose to move pieces to two unoccupied hexagons or a single occupied hexagon on each turn. Avoid trapping your...

## Letters Puzzle Game

First, complete the puzzle by using each of the letters from 'Celebration of Mind' three times to fill in this puzzle with 13 words. Then, play head-to-head to cover up repeated letters quicker than your opponent. Submitted by: Jeremiah Farrell Time Required: 30...

## Recreational Mathematics

Martin Gardner recounts 25 years of puzzles and discoveries in this Scientific American article. Many of his very own puzzles are featured and their mathematical solutions are described in depth in this 1998 feature article. Source: Scientific American Time Required:...

## Semi-Magic Squares

Semi-magic squares are thought of as matrices in this arithmetic exploration. Split up a a shuffled deck of cards to create a magic-square out of playing cards with additional challenges. Submitted by: James Tanton Time Required: 30 minutes You’ll Need: paper, pencil,...

## Square Permutations

Do square permutations always exist? Work through solutions and scenarios through this exploration activity. Submitted by: James Tanton Time Required: 30 minutes You’ll Need: paper and pencil [maxbutton id="4"...

## Dividing Squares into Triangles

Explore the complexities in dividing squares into triangles. How many different ways can you divide a square into triangles of equal area? Attempt to answer this question, and others, while solving multiple challenges throughout the activity. Submitted by: James...

## Sliding Around

Robert A. Hearn's Martin Gardner-inspired, coin-sliding puzzle takes sliding-coin puzzles to the next level. Instead of solving the puzzle in the fewest number of moves, these puzzles are similar to sliding-block puzzles in that there are specific places where coins...

## Math Puzzle Booklets

The Julia Robinson Mathematics Festival has gathered 44 pages of fun, mathematical puzzles. Solve squareable and trapezoidal numbers, staircase numbers, word and non-word puzzles, logic puzzles, and more with these four booklets packed full of challenges! Source:...

## Coin Puzzles

Play online or download popular coin puzzles at The Puzzle Playground. Slide, remove, or rearrange coins to form new patterns to solve these creative challenges. Source: Puzzles.com Time Required: 15 minutes + per puzzle You’ll Need: coins, or pen/pencil [maxbutton...

## NumCode

Use revealed segments of digits to fill in each grid's cells made of of numbers 1 through 9. With their Sudoku-like style, these unique visual challenges are quite addictive! Submitted by: Peter Grabarchuk at Puzzlium Time Required: 15 minutes+ per puzzle You’ll Need:...

## Puzzlium Cut by Painting ABC

Use visual spatial reasoning to cut each shape into the number of identical parts shown. Rotation and/or reflection of pieces are allowed, making solutions more challenging than puzzles initially appear. Submitted by: Peter Grabarchuk at Puzzlium Time Required: less...

## Puzzlium Hardest Puzzles

How quickly can you solve three of Puzzlium's most challenging puzzles? Put your writing instrument and scissors to the test in these logic and visual spatial challenges. Submitted by: Peter Grabarchuk at Puzzlium Time Required: 15 minutes to 60 minutes per puzzle...

## Retrolife Puzzles

These elegant logic puzzles are played with black and white colored counters and an open grid. Arrange them into challenges of your own and see how long it takes you to solve them. Submitted by: Yossi Elran Time Required: 30 minutes + You’ll Need: black and white...

## Magic Square Game

Based on Leonard Euler’s Semi Magic Squares. Arrange the 16 cubes into a magic square, find a partner and play a magic cube game where you take turns placing the pieces into a square. Choose your pieces carefully--if you place a cube in a row with another cube of the...

## Armand Tribute Crossword Puzzle

If you’re thinking you don’t know much about Armand T. Ringer and therefore won’t have much success at a related crossword puzzle, think again. This poet and math enthusiast might be someone that you’re actually quite familiar with. Need a hint? Look at the letters in...

## Games Kit

A collection of 12 classic games that were part of the Portuguese Championship of Mathematical games (2004-2013). Each of the selected games strengthens focus, visualization, forward thinking, and problem solving skills and can easily be created using simple household...

## Wordless Geometry

Can you figure out what fraction of each shape is shaded? It seems tricky but you don’t even need a paper or pencil to solve these simple puzzles—just look carefully and use some clever thinking! Submitted by: Daniel Finkel Time Required: 10 minutes + You’ll Need: the...

## Latin Erdős

A Sudoku-like strategy game in which players take turns placing numbered tokens on a grid. Tokens must be placed so that no single number appears twice in a row or column. It’s no simple task, but it’s possible to fill an entire grid with numbers! Submitted by: Jorge...

## Card Deck of Games

Rules to 26 simple pencil and paper games including classics such as Nim, Dots and Boxes, Sudoku, Hex and others you’ve likely never heard of before! Submitted by: Jorge Nuno Silva Time Required: 15 minutes + per game You’ll Need: paper & pencil [maxbutton id="4"...

## Mathemagician Crossword

Calling all mathemagicians! Solve all 127 magical clues to complete this New York Times Thursday crossword puzzle. Submitted by: Dana Richards Time Required: 30 minutes + You’ll Need: pen or pencil [maxbutton id="4"...

## 74G4G7

In this edge-matching puzzle you’ll have to figure out how to arrange seven double-sided hexagons in a hexagonal pattern so that all of the meeting corners on both sides match either with dots or without. There are two solutions to this brain boggler! Submitted by:...

## Patterns II

A clever logic game in which one player designs a secret master pattern and the other players work to uncover it with as few clues as possible. This one is sure to strengthen those inductive reasoning skills! Submitted by: prepared by John Miller, from Gamut of Games,...

## Mathematically Correct Breakfast

Turn an ordinary breakfast into magic by following these simple instructions on how to slice a bagel into two linked halves. Not only is it more fun to eat a bagel this way, but you'll have slightly more surface area to apply your cream cheese! Submitted by: George W....

## Martin Gardner Puzzles

Here you will find dozens of Martin Gardner related puzzles and solutions. Play online or download and print. Submitted by: ThinkFun and Puzzles.com Time Required: up to you! [maxbutton id="4" url="http://www.puzzles.com/puzzleplayground/Authors/MartinGardner.htm"...

## MARTIN 6×6 Challenge

A Sudoku sliding puzzle using the letters in Martin’s name. Complete the puzzle so that the 6 horizontal and vertical rows contain all six colors and the six letters of Martin’s name in any order. Submitted by: Kate Jones Time Required: 30 minutes + You’ll Need:...

## Nobbly Wobbly Workshop

Host your own Nobbly Wobbly Workshop! Materials and resources will leave your group considering the aesthetics, psychology, and mathematics involved in quality puzzle making and solving. Submitted by: Dick Esterle Time Required: 20 minutes + You’ll Need: scissors and...

## Vi Hart Balloon Booklet

In this edge-matching puzzle you’ll have to figure out how to arrange seven double-sided hexagons in a hexagonal pattern so that all of the meeting corners on both sides match either with dots or without. There are two solutions to this brain boggler! Submitted by: Vi...

## Dots & Boxes Game

Download & Print the Template: Download our Dots & Boxes template! Then print as many game sheets as you want. This is a classic pen-and-paper game that everyone should learn how to play. Watch the "How to Play" Video: Directions for game play narrated by Jon...