Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?
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 parallelogram.
Using the digits 1 to 9, the number 4396 can be written as the product of two numbers. Can you find the factors?
The clues for this Sudoku are the product of the numbers in adjacent squares.
Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?
It would be nice to have a strategy for disentangling any tangled ropes...
This Sudoku combines all four arithmetic operations.
What's the largest volume of box you can make from a square of paper?
Can you use your powers of logic and deduction to work out the missing information in these sporty situations?
