Tag: puzzles

Ultimate Tic Tac Toe

Ultimate tic-tac-toe is a board game composed of nine tic-tac-toe boards arranged in a 3 × 3 grid. Players take turns playing in the smaller tic-tac-toe boards until one of them wins in the larger tic-tac-toe board. Compared to traditional tic-tac-toe, strategy in this game is conceptually more difficult and has proven more challenging for […]

Trading Spaces

Slide Color A and Color B pieces along the entire straight path until Color A pieces have exchanged positions with the Color B pieces. No two pieces can be on the same circle at the same time. What are the fewest moves possible? Play the online version here. . . .

Circular NIM

A two-person strategy game/Un juego de estratégias de dos personas Materials/Materiales One game board/Un tablero 13 markers/13 piezas DIRECTIONS/INSTRUCCIONES Place one marker in each circle. Coloque una pieza en cada círculo. Players take turns removing one or two markers. If you take two markers, they must be from adjacent circles. Los jugadores toman turnos quitan […]

Mill/Nine Men’s Morris

Nine men’s morris is a strategy board game for two players dating at least to the Roman Empire. The game is also known as nine-man morris, mill, mills, the mill game, merels, merrills, merelles, marelles, morelles, and ninepenny marl in English. The game has also been called cowboy checkers and is sometimes printed on the […]

Equilateral Triangle Puzzle

At the start of the school year, I came across this tweet by @MathEqualsLove… This Week’s Puzzle: Equilateral Triangle. This puzzle is always a favorite! https://t.co/tPyH2w2spF #mtbos #iteachmath #teach180 #puzzlingclassroom pic.twitter.com/8Se6RJJepj — Sarah Carter (@mathequalslove) August 26, 2019 I loved the Equilateral Puzzle, so I finally got around to sharing it with teachers during a […]

Dice Tic-Tac-Sum

You’ll need a pen, piece of paper, and nine number cubes. Draw a tic-tac-toe board, and arrange the number cubes so that there is one cube per spot.  Change the face of the cube so that for every possible three-in-a-row (like Tic-Tac-Toe) the dice all sum to the same quantity. Of course, all dice being […]


Set (stylized as SET) is a real-time card game designed by Marsha Falco in 1974 and published by Set Enterprises in 1991. The deck consists of 81 unique cards that vary in four features across three possibilities for each kind of feature: number of shapes (one, two, or three), shape (diamond, squiggle, oval), shading (solid, […]

Four by Four NIM

Similar to Traditional NIM, two players alternate turns picking up tiles.  The objective is still to be the player to pick up the last tile. What is different is the arrangement of the tiles at the beginning of the game.  Tiles are arranged into a 4×4 grid, like so…   For this game players are […]

Eight by Eight Puzzle

A one-person game/Un juego de una persona Materials/Materiales One game board/Un tablero del juego 8 stones/8 piedras DIRECTIONS/INSTRUCCIONES Place eight stones in this shape so that NO two stones are in the same row, column, or diagonal (even the small diagonals). Coloque ocho piedras en la forma para que NINGUNA de las dos piedras estén […]