Advent Calendar 2010 - a mathematical game for every day during the run-up to Christmas.

The computer starts with all the lights off, but then clicks 3, 4 or 5 times at random, leaving some lights on. Can you switch them off again?

A game for two people, who take turns to move the counters. The player to remove the last counter from the board wins.

Everthing you have always wanted to do with dominoes! Some of these games are good for practising your mental calculation skills, and some are good for your reasoning skills.

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...

A game for 2 people. Take turns joining two dots, until your opponent is unable to move.

Solve this Sudoku puzzle whose clues are in the form of sums of the numbers which should appear in diagonal opposite cells.

A Sudoku with clues given as sums of entries.

This article for teachers describes several games, found on the site, all of which have a related structure that can be used to develop the skills of strategic planning.

A game for 1 person. Can you work out how the dice must be rolled from the start position to the finish? Play on line.

Can you use the numbers on the dice to reach your end of the number line before your partner beats you?

Can you work out how to win this game of Nim? Does it matter if you go first or second?

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.

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

A game for 2 players. Given a board of dots in a grid pattern, players take turns drawing a line by connecting 2 adjacent dots. Your goal is to complete more squares than your opponent.

Help the bee to build a stack of blocks far enough to save his friend trapped in the tower.

A game somewhat similar to 'noughts and crosses' on a much larger space.

In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you do so that you get to the end of the number line first?

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

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

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?

You'll need two dice to play this game against a partner. Will Incey Wincey make it to the top of the drain pipe or the bottom of the drain pipe first?

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

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

In this game you throw two dice and find their total, then move the appropriate counter to the right. Which counter reaches the purple box first? Is this what you would expect?

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.

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.

Can you beat Piggy in this simple dice game? Can you figure out Piggy's strategy, and is there a better one?

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.

A game for 2 players. Using 2 dice, some counters and a games board, can you form a line of counters from one side of the board to the other?

A game for two players. You'll need some counters and somewhere to draw a board.

An extension of noughts and crosses in which the grid is enlarged and the length of the winning line can to altered to 3, 4 or 5.

Exchange the positions of the two sets of counters in the least possible number of moves

Can you make the birds from the egg tangram?

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 people. Take turns placing a counter on the star. You win when you have completed a line of 3 in your colour.

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.

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

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