problem Growing Garlic Age 5 to 11 Challenge level Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?
problem Factor-Multiple Chains Age 7 to 11 Challenge level Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?
problem Magnetic personality Age 7 to 16 Challenge level 60 pieces and a challenge. What can you make and how many of the pieces can you use creating skeleton polyhedra?
problem Seasonal Twin Sudokus Age 11 to 16 Challenge level This pair of linked Sudokus matches letters with numbers and hides a seasonal greeting. Can you find it?
problem One to Fifteen Age 7 to 11 Challenge level Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
problem Noughts and crosses Age 11 to 14 Challenge level Ever thought of playing three dimensional Noughts and Crosses? This problem might help you visualise what's involved.
problem Twin Corresponding Sudoku Age 11 to 18 Challenge level This sudoku requires you to have "double vision" - two Sudoku's for the price of one
problem Factors and Multiples Puzzle Age 11 to 14 Challenge level Using your knowledge of the properties of numbers, can you fill all the squares on the board?
problem Pole Star Sudoku Age 14 to 18 Challenge level A Sudoku based on clues that give the differences between adjacent cells.