Working systematically

problem

Seasonal Twin Sudokus

Age

11 to 16

Challenge level

1 out of 3

This pair of linked Sudokus matches letters with numbers and hides a seasonal greeting. Can you find it?
problem

Ratio Sudoku 2

Age

11 to 16

Challenge level

1 out of 3

A Sudoku with clues as ratios.
problem

Ratio Sudoku 3

Age

11 to 16

Challenge level

1 out of 3

A Sudoku with clues as ratios or fractions.
problem

Intersection Sudoku 2

Age

11 to 16

Challenge level

1 out of 3

A Sudoku with a twist.
problem

Alphabetti Sudoku

Age

11 to 16

Challenge level

1 out of 3

This Sudoku requires you to do some working backwards before working forwards.
problem

Twin Corresponding Sudokus II

Age

11 to 16

Challenge level

1 out of 3

Two sudokus in one. Challenge yourself to make the necessary connections.
problem

Quadruple Clue Sudoku

Age

11 to 16

Challenge level

1 out of 3

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

Another Quadruple Clue Sudoku

Age

11 to 16

Challenge level

1 out of 3

This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.
problem

Who's Who?

Age

11 to 16

Challenge level

2 out of 3

Can you solve the clues to find out who's who on the friendship graph?
problem

Logo Challenge - Triangles-Squares-Stars

Age

11 to 16

Challenge level

2 out of 3

Can you recreate these designs? What are the basic units? What movement is required between each unit? Some elegant use of procedures will help - variables not essential.