Calcudoku. Mathematical Sudoku

An engaging mathematical puzzle that combines Sudoku logic with arithmetic challenges. Fill the grid with numbers so that they don't repeat in any row or column, and within the highlighted 'cages', the specified arithmetic operation (+, −, ×, ÷) must produce the indicated target number. The game offers grid sizes from 3×3 to 9×9 and three difficulty levels — from beginner to expert — making it enjoyable for both children and experienced number puzzle enthusiasts.