How to Play

MathDoku puzzles exercise both logical deduction and mental arithmetic in a compact grid format. Each cage's target and operation constrain which digits can appear inside it, and the Latin-square rule — no repeats in any row or column — further restricts placements. Smaller cages with division or subtraction are especially powerful because they have very few valid fills: a two-cell subtraction cage with target one on a six-by-six grid can only hold consecutive digit pairs. Solving efficiently requires balancing cage arithmetic with row-column elimination. Each puzzle on this page has exactly one valid solution. Before placing digits, note the grid size because it determines the digit range — a four-by-four grid uses digits one through four, while a six-by-six grid uses one through six.

1. Note the grid size N to determine the valid digit range from one through N for every cell in the puzzle.
2. Examine single-cell cages first — these are freebies with the target digit placed directly since no operation applies.
3. For each multi-cell cage, list all digit combinations that produce the target under the given operation without repeating a digit if the cage spans a single row or column.
4. Cross-reference cage candidate lists with row and column constraints to eliminate impossible digits from shared positions.
5. Fill confirmed cells and propagate eliminations across intersecting rows, columns, and cages until every cell is determined.