---
title: "Hard Calcudoku: free printable with answers"
description: "Free printable hard Calcudoku with answers. A bigger grid for a longer solve, with one solution. Print with the answer."
source: "https://www.oncebooks.com/calcudoku/hard"
---

1. [Home](https://www.oncebooks.com/)
2. [Calcudoku](https://www.oncebooks.com/calcudoku)
3. Hard

Free printable

# Hard Calcudoku

A hard Calcudoku gives the logic more room to work. fill 1 to N once per row and column so every cage reaches its target. It still resolves to exactly one solution, printed on page two.

PuzzleDesign

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.

Theme

ClassicBoldSoftShadedNavyIndigoSkyTealEmeraldForestPlumBerryCrimsonEmberAmberCocoa

**Customise colours**

Numbers

Cell lines

Box lines

Page background

Style

StandardClean

Clean drops the title band and footer, leaving the grid.

Generate puzzlePrint / save PDF

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](https://app.oncebooks.com/publisher-studio/calcudoku/edit?from=calcudoku&v=2&s=eyJkaWZmaWN1bHR5IjoiSEFSRCIsImNvbG9yVGhlbWUiOnsidGhlbWVJZCI6ImNsYXNzaWMiLCJvdmVycmlkZXMiOnt9fX0)

Free to build · pay once to export

Preview

The puzzle and its answer, as they print.

Hide the preview

- Calcudoku Hard

  1

  Puzzle
- Calcudoku Hard · Solution

  2

  Solution

Generate puzzlePrint / save PDF

## 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

1. Read each cage. The small label is the target and the operator the cage must reach: a sum, difference, product or quotient of its cells.
2. Start 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.
3. List 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.
4. Cross 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.

## Making a whole Calcudoku book?

This page makes one puzzle. To publish a book on Amazon KDP, the [KDP Calcudoku maker](https://www.oncebooks.com/kdp-calcudoku-maker) generates hundreds of graded puzzles at any trim, as a print-ready 300 DPI interior and solutions PDF.

## More printable Calcudoku

- [Easy Calcudoku](https://www.oncebooks.com/calcudoku/easy)
- [Medium Calcudoku](https://www.oncebooks.com/calcudoku/medium)
- [Large Calcudoku](https://www.oncebooks.com/calcudoku/large)
- [Calcudoku for kids](https://www.oncebooks.com/calcudoku/for-kids)
- [Calcudoku for beginners](https://www.oncebooks.com/calcudoku/for-beginners)

[See every printable Calcudoku](https://www.oncebooks.com/calcudoku)

## Questions

**Are these hard calcudoku free to print?**

Yes. Generate the puzzle above and print it with its answer, at no cost and with no sign-up.

**Does every puzzle have one solution?**

Yes. Every puzzle is generated and checked so the clues fix exactly one solution, verified before it prints. The answer is on the second page.

**Can I make a Calcudoku book to sell on KDP?**

Yes. The free tool makes one puzzle. The KDP Calcudoku maker generates hundreds of graded puzzles at any KDP trim, as a print-ready 300 DPI interior and solutions PDF.