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'Square It' printed from http://nrich.maths.org/
This game can be played against the computer, or against a friend.
Players take it in turns to click on a dot on the grid - first player's dots will be red and the second player's (or computer's) will be blue. The winner is the first to have four dots that can be joined by straight lines to form a square.
Squares can be any size and can be tilted.
For an extra challenge, why not increase the size of the grid using the arrow buttons?
If you are not using the interactivity, you may like to print off this page of grids
to use or this sheet
which is one large grid.
Full Screen Version
This text is usually replaced by the Flash movie.