Working systematically
problem
Colour Islands Sudoku
Age
11 to 14
Challenge level
An extra constraint means this Sudoku requires you to think in
diagonals as well as horizontal and vertical lines and boxes of
nine.
problem
Cubes Here and There
Age
7 to 11
Challenge level
How many shapes can you build from three red and two green cubes? Can you use what you've found out to predict the number for four red and two green?
problem
Quadruple Clue Sudoku
Age
11 to 16
Challenge level
Four numbers on an intersection that need to be placed in the
surrounding cells. That is all you need to know to solve this
sudoku.
problem
tiling
Age
7 to 11
Challenge level
An investigation that gives you the opportunity to make and justify predictions.
problem
Twin Corresponding Sudokus II
Age
11 to 16
Challenge level
Two sudokus in one. Challenge yourself to make the necessary
connections.
problem
All-Variables Sudoku
Age
11 to 18
Challenge level
The challenge is to find the values of the variables if you are to
solve this Sudoku.
problem
LCM Sudoku
Age
14 to 16
Challenge level
Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.
problem
Shaping Up
Age
7 to 11
Challenge level
Are all the possible combinations of two shapes included in this
set of 27 cards? How do you know?
problem
Oh! Harry!
Age
7 to 11
Challenge level
A group of children are using measuring cylinders but they lose the labels. Can you help relabel them?