This type of puzzle is based on Sudoku, but it uses shapes instead of numbers. Since the puzzles are for children, they are simplified to a 4×4 grid.
The theme used in this example of how to solve the puzzle is ‘Viking battle,’ with the symbols of an axe, a sword, a shield, and a helmet.
Not all the puzzle made by SW publisering have a 2×2 grid, so they are a bit more difficult. The principle for solving the puzzle remains the same.