We think this 3x3 version of the game is often harder than the 5x5 version. Do you agree? If so, why do you think that might be?

Unmultiply is a game of quick estimation. You need to find two numbers that multiply together to something close to the given target - fast! 10 levels with a high scores table.

All you need for this game is a pack of cards. While you play the game, think about strategies that will increase your chances of winning.

Try this matching game which will help you recognise different ways of saying the same time interval.

Hover your mouse over the counters to see which ones will be removed. Click to remover them. The winner is the last one to remove a counter. How you can make sure you win?

In this game for two players, you throw two dice and find the product. How many shapes can you draw on the grid which have that area or perimeter?

Can you make the birds from the egg tangram?

Here is a version of the game 'Happy Families' for you to make and play.

In this matching game, you have to decide how long different events take.

Take it in turns to make a triangle on the pegboard. Can you block your opponent?

A shunting puzzle for 1 person. Swop the positions of the counters at the top and bottom of the board.

Can you spot the similarities between this game and other games you know? The aim is to choose 3 numbers that total 15.

Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

In this article for teachers, Liz Woodham describes the criteria she uses to choose mathematical games for the classroom and shares some examples from NRICH.

Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?

A game for 2 players. Can be played online. One player has 1 red counter, the other has 4 blue. The red counter needs to reach the other side, and the blue needs to trap the red.

A game for 2 players. Take turns to place a counter so that it occupies one of the lowest possible positions in the grid. The first player to complete a line of 4 wins.

An ordinary set of dominoes can be laid out as a 7 by 4 magic rectangle in which all the spots in all the columns add to 24, while those in the rows add to 42. Try it! Now try the magic square...

Work out the fractions to match the cards with the same amount of money.

The game uses a 3x3 square board. 2 players take turns to play, either placing a red on an empty square, or changing a red to orange, or orange to green. The player who forms 3 of 1 colour in a line. . . .

An article for teachers and pupils that encourages you to look at the mathematical properties of similar games.

This is a game for 2 players. Each player has 4 counters each, and wins by blocking their opponent's counters. A good follow-on from two stones.

A game for 1 or 2 people. Use the interactive version, or play with friends. Try to round up as many counters as possible.

A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.

A Sudoku with clues given as sums of entries.

A game for two or more players that uses a knowledge of measuring tools. Spin the spinner and identify which jobs can be done with the measuring tool shown.

This is a challenging game of strategy for two players with many interesting variations.

Use the tangram pieces to make our pictures, or to design some of your own!

A game to make and play based on the number line.

Basic strategy games are particularly suitable as starting points for investigations. Players instinctively try to discover a winning strategy, and usually the best way to do this is to analyse. . . .

The aim of the game is to slide the green square from the top right hand corner to the bottom left hand corner in the least number of moves.

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.

Take it in turns to place a domino on the grid. One to be placed horizontally and the other vertically. Can you make it impossible for your opponent to play?

A maths-based Football World Cup simulation for teachers and students to use.

Board Block game for two. Can you stop your partner from being able to make a shape on the board?

Nim-7 game for an adult and child. Who will be the one to take the last counter?

Square It game for an adult and child. Can you come up with a way of always winning this game?

Four Go game for an adult and child. Will you be the first to have four numbers in a row on the number line?

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.

Train game for an adult and child. Who will be the first to make the train?

Strike it Out game for an adult and child. Can you stop your partner from being able to go?

Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?

Spiralling Decimals game for an adult and child. Can you get three decimals next to each other on the spiral before your partner?

Board Block Challenge game for an adult and child. Can you prevent your partner from being able to make a shape?

Totality game for an adult and child. Be the first to reach your agreed total.