Calcudoku (also called Mathdoku) is a Latin square with arithmetic cages: fill 1 to N once per row and column, and make every outlined cage reach its printed target by its operator.

Is this Calcudoku generator free?

Yes. Pick a difficulty, generate a puzzle and print it with its answer, with no sign-up and no watermark. It is free for classroom, home and personal use.

Does every puzzle have one solution?

Yes. Every puzzle is generated and checked by the same solver our Publisher Studio uses, so the clues fix exactly one solution. A puzzle is never ambiguous or unsolvable.

Does it include the answer?

Yes. Every puzzle prints as two pages: the puzzle on page one and its answer on page two, so you can check your work.

What size are the pages?

The free tool prints at 8.25 by 11 inches, a popular large-print size. Our Publisher Studio will export the same book at any KDP trim, from 5.06 by 7.81 up to 8.27 by 11.69, as a print-ready 300 DPI interior.

Free tool

Free Calcudoku generator, with the answer

Pick a size and generate a Calcudoku, then print it with its answer. Every puzzle has one solution, with no sign-up and no watermark. It runs on the same engine as our KDP Publisher Studio.

Difficulty

Larger grids and bigger cages are harder. Every puzzle has one solution.

5×5 grid. Fill 1 to N once per row and column so every cage reaches its target.

Two pages: the puzzle and its answer. Every puzzle has one solution, checked by the same engine as our KDP studio.

Want the whole book?

This makes one puzzle. Sign up to turn it into a full Calcudoku book for Amazon KDP: hundreds of graded puzzles at any trim, as print-ready PDFs.

Build the full book

Free to build · pay once to export

Preview

The puzzle and its answer, as they print.

Calcudoku Medium

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Calcudoku Medium · Solution

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How to make a Calcudoku puzzle

1Pick a difficulty. Choose a grid size. Larger grids give the logic more room, so they take longer to solve.
2Generate the puzzle. Press Generate puzzle. You get a fresh grid, proved to have exactly one solution.
3Print the two pages. Press Print / save PDF. You get two pages: the puzzle on page one and its answer on page two.

How to solve a calcudoku

Fill the grid with 1 to N once in each row and column so every outlined cage combines by its operator to its target.

The method

1Read each cage. The small label is the target and the operator the cage must reach: a sum, difference, product or quotient of its cells.
2Start with single-cell cages. A cage of one cell is just that number given, so place it first and let it constrain its row and column.
3List the combinations. For a cage, work out which sets of digits reach its target, then cross off any that repeat a digit in a shared row or column.
4Cross cages with rows and columns. A digit must satisfy its cage and keep its row and column to 1 to N once each. Where only one option does both, lock it in.

The one rule: 1 to N once per row and column, and every cage hits its target.
What the answer page shows: The completed grid is printed at the back.
How the grades differ: Bigger grids and larger cages leave more combinations to weigh.
Good for: Solvers who like arithmetic with their logic.

Publishing a whole book?

This tool makes one puzzle for home or the classroom. To make a Calcudoku book you can sell on Amazon KDP, Publisher Studio generates hundreds of graded puzzles across a difficulty curve, at any KDP trim, as a print-ready interior and solutions PDF.

See the KDP Calcudoku maker

Questions

What is Calcudoku?: Calcudoku (also called Mathdoku) is a Latin square with arithmetic cages: fill 1 to N once per row and column, and make every outlined cage reach its printed target by its operator.
Is this Calcudoku generator free?: Yes. Pick a difficulty, generate a puzzle and print it with its answer, with no sign-up and no watermark. It is free for classroom, home and personal use.
Does every puzzle have one solution?: Yes. Every puzzle is generated and checked by the same solver our Publisher Studio uses, so the clues fix exactly one solution. A puzzle is never ambiguous or unsolvable.
Does it include the answer?: Yes. Every puzzle prints as two pages: the puzzle on page one and its answer on page two, so you can check your work.
What size are the pages?: The free tool prints at 8.25 by 11 inches, a popular large-print size. Our Publisher Studio will export the same book at any KDP trim, from 5.06 by 7.81 up to 8.27 by 11.69, as a print-ready 300 DPI interior.

Short of ideas? Browse our ready-made printables for this puzzle and print one today.