Working systematically

  • Ratio Sudoku 2
    problem

    Ratio Sudoku 2

    Age
    11 to 16
    Challenge level

    A Sudoku with clues as ratios.

  • Ratio Sudoku 3
    problem

    Ratio Sudoku 3

    Age
    11 to 16
    Challenge level

    A Sudoku with clues as ratios or fractions.

  • Alphabetti Sudoku
    problem

    Alphabetti Sudoku

    Age
    11 to 16
    Challenge level

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

  • Twin Corresponding Sudokus II
    problem

    Twin Corresponding Sudokus II

    Age
    11 to 16
    Challenge level

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

  • Quadruple Clue Sudoku
    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.

  • Another Quadruple Clue Sudoku
    problem

    Another Quadruple Clue Sudoku

    Age
    11 to 16
    Challenge level

    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.

  • Who's who?
    problem

    Who's Who?

    Age
    11 to 16
    Challenge level

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

  • LOGO Challenge - Triangles-Squares-Stars
    problem

    Logo Challenge - Triangles-Squares-Stars

    Age
    11 to 16
    Challenge level

    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.

  • LOGO Challenge - The logic of LOGO
    problem

    Logo Challenge - The Logic of Logo

    Age
    11 to 16
    Challenge level

    Just four procedures were used to produce a design. How was it done? Can you be systematic and elegant so that someone can follow your logic?

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