Collect as many diamonds as you can by drawing three straight lines.
Can you find a reliable strategy for choosing coordinates that will locate the robber in the minimum number of guesses?
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.
Can you be the first to complete a row of three?
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.
Four friends must cross a bridge. How can they all cross it in just 17 minutes?
How have "Warmsnug" arrived at the prices shown on their windows? Which window has been given an incorrect price?
A game in which players take it in turns to choose a number. Can you block your opponent?
The clues for this Sudoku are the product of the numbers in adjacent squares.
Who said that adding, subtracting, multiplying and dividing
couldn't be fun?
Do you know a quick way to check if a number is a multiple of two? How about three, four or six?
Can you do a little mathematical detective work to figure out which number has been wiped out?
Gabriel multiplied together some numbers and then erased them. Can you figure out where each number was?
There is nothing half so much worth doing as simply messing about in boats...
Here's a neat trick you can do with an 11 by 11 square...