Puzzle rules
Math Square
Fill the grid so every row and column matches its outside sum. Use each allowed number exactly once: normally 1–9 in a 3×3 grid or 1–16 in a 4×4 grid.
How to solve
Complete rules
Goal: Complete the grid so all row and column sums are correct. Rules: - Use every number in the allowed range exactly once. - A 3×3 puzzle uses the numbers 1–9; a 4×4 puzzle uses the numbers 1–16, unless another range is shown. - The numbers in each row must add to its clue on the right. - The numbers in each column must add to its clue below.