4x4 Magic Square Puzzles

What is a Magic Square

A magic square is a grid of distinct numbers arranged in such a way that the sums of the numbers in each row, column, and both diagonals are the same. This constant sum is called the magic constant or magic sum.

Magic squares can vary in size (e.g., 3×3, 4×4), with 'n' representing the number of rows and columns in the square. The square is filled with integers from a given set, usually consecutive integers starting from 1.

Rules / How to Play

• Grid Size: Magic squares can be of any size, but the most common are 3 x 3, 4 x 4, and 5 x 5.
• Number Range: The numbers used to fill the grid usually range from 1 to the square of the grid size (e.g., for a 3 x 3 square, the numbers are 1 to 9).
• Unique Numbers: Each number in the square appears only once.
• Magic Constant: The sum of the numbers in each row, column, and diagonal equals the same value. The magic constant can be calculated using the formula: (n^3 + n) / 2, where "n" is the size of the square. For a 3x3 square, the magic constant is 15.
• Equal Sums: The sum of each row, column, and diagonal must equal the magic constant.

Solving Tips and Techniques:

While there are various methods to solve magic squares, here are some common techniques.

• Identify the Magic Constant: Use the formula M=n(n^2+1)/2 to calculate the target sum for rows, columns, and diagonals.
• Odd-Sized Squares: For odd-sized squares (3 × 3, 5 × 5, etc.), the center number is always M/n. For example, in a 3×3 magic square, the center is 5 (middle of 1 to 9).
• Siamese Method (Odd n): Place the number 1 in the middle of the top row. Place each subsequent number in the square diagonally up and to the right. If the position is occupied or out of bounds, move down vertically one space instead.
• Divide-and-Conquer (Even n): Split the square into quadrants and arrange smaller n/2 × n/2 magic squares. Adjust positions to maintain the magic constant.
• Trial and Error: Start by placing numbers in the grid, trying different combinations until all rows, columns, and diagonals add up to the magic constant.

With practice, solving magic squares becomes intuitive, and you'll recognize patterns and strategies more easily!