Puzzle 1
Colour Sudoku
Fill the grid. Every row, column and 2×2 box needs all four colours.
Tap a colour, then tap a square.
Colour Sudoku is a free online logic puzzle from Logicology. Fill the 4×4 grid so that every row, every column and every 2×2 box has all four colours, red, green, blue and yellow, exactly once. Because it uses colours instead of numbers, children can start before they are confident with digits, and it builds the same reasoning as a full number sudoku.
Tap a colour in the tray, then tap a square to fill it. Use the eraser to clear a square, Hint to fill one square for you and Reset to start again. There are three puzzles to solve.
For more puzzles like this, see the Logicoland puzzle books, or build calculation speed with the free Speed Maths games.
Fill the grid. Every row, column and 2×2 box needs all four colours.
Tap a colour, then tap a square.