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A game for 2 players that can be played online. Players take it in turns to select a word from the 9 words given. The aim is to select all the occurrences of the same letter.

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Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?

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A train building game for two players. Can you be the one to complete the train?

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Can you put the 25 coloured tiles into the 5 x 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?

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What shaped overlaps can you make with two circles which are the same size?

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Calculate the fractional amounts of money to match pairs of cards with the same value.

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Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.

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Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.

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These interactive dominoes can be dragged around the screen.

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Use the interactivity to find out how many quarter turns the man must rotate through to look like each of the pictures.

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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.

The 2012 primary advent calendar features twenty-four of our posters, one for each day in the run-up to Christmas.

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

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

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

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Stop the Clock game for an adult and child. How can you make sure you always win this game?

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A game in which players take it in turns to choose a number. Can you block your opponent?

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

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A game for two people that can be played with pencils and paper. Combine your knowledge of coordinates with some strategic thinking.

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Play this well-known game against the computer where each player is equally likely to choose scissors, paper or rock. Why not try the variations too?

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Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

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Practise your number bonds whilst improving your memory in this matching pairs game.

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This is a game for two players. Can you find out how to be the first to get to 12 o'clock?

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Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.

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Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?

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Practise your tables skills and try to beat your previous best score in this interactive game.

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How many different triangles can you draw on the dotty grid which each have one dot in the middle?

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Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.

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How many trains can you make which are the same length as Matt's and Katie's, using rods that are identical?

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Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

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What is the greatest number of squares you can make by overlapping three squares?

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Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.

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Sort the houses in my street into different groups. Can you do it in any other ways?

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Here is a chance to play a version of the classic Countdown Game.

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This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

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Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?

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What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?

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In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

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First Connect Three game for an adult and child. Use the dice numbers and either addition or subtraction to get three numbers in a straight line.

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Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?

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Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?

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Here are some rods that are different colours. How could I make a yellow rod using white and red rods?

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Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?