# Paper Sudoku: Classic & Killer — Logic puzzles for Apple Pencil

> Digital Sudoku app replicating the pen-on-paper experience with advanced features. (iPhone/iPad app by Tobeas Brennan.)

- Source: https://appshunter.io/ios/app/paper-sudoku-classic-and-killer/id1562442061 (this page in markdown: same URL + `.md`)
- Developer: [Tobeas Brennan](https://appshunter.io/developer/1454513051)
- Category: Games, Education, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 4.84/5 from 1,379 App Store ratings · 103 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 69 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2021-06-24
- Data updated: 2026-11-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/paper-sudoku-classic-and-killer/id1562442061/reviews.md

## What is Paper Sudoku?

Sudoku is best on paper. Paper Sudoku is the only app that keeps it that way.

Write your numbers with Apple Pencil, in your own handwriting, exactly as you would in a puzzle book - then let the iPad handle the parts paper can't. No smudged pencil marks, no rubbing a hole in the page, no starting the whole grid again because of one wrong digit twenty moves ago.

NEW IN VERSION 4.0

Killer Sudoku, written by hand - cages, sums and all.

Mini. Quick 6x6 games, for when you have a few minutes rather than an hour.

More puzzles, and difficulty recalibrated from the ground up - with far more at expert.

Learn now walks you through advanced strategies step by step, showing exactly which cells each one rules out and why.

Writing rebuilt from the ground up: strokes land faster, automatic note recognition is more reliable, and games are far easier on the battery.

Paper Sudoku now speaks Spanish, French, German, Italian, Portuguese, Japanese, Korean and Simplified Chinese as well as English.

WRITTEN, NOT TAPPED

Built for Apple Pencil from the first line of code - not a number pad with handwriting bolted on. Pencil marks and candidate notes stay in your own hand, and when you would rather not write out a full set, notes fill themselves on demand.

FOR EVERY SOLVER

Highlighting to trace a digit across rows, columns and boxes. Check the whole grid for errors with a single tap. Unlimited undo and redo, so an experiment costs you nothing. And the interactive Learn mode teaches the strategies themselves, from the first scan of a grid to the techniques that crack an expert.

Unlimited puzzles. Every one playable offline, anywhere - a puzzle book that never runs out.

## Key features

- Unlimited Sudoku puzzles
- Pen-on-paper feel
- Apple Pencil optimized
- Auto-fill notes
- Interactive solver mode
- Pencil marks and highlighting
- One-click error checking

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium version | $12.99 | one-time |


## What do users think of Paper Sudoku?

Reviews of Paper Sudoku are mostly positive: the game is rated 4.8/5 from 1.4K App Store ratings. What users like most: very addictive, perfect sudoku game. Top complaints: highlighter glitch, incorrect error detection. Summarized from real user reviews.

**Pros**

- 🚀 Very addictive
- 👍 Perfect sudoku game
- 👍 Incredible handwriting recognition
- 👍 Apple Pencil support
- 👍 Convenient to use
- 👍 Realistic game experience
- 👍 Intuitive interface
- 👍 Helpful learning and tips features
- 👍 Customizable options
- 👍 Minimal ads
- 👍 One-time purchase option

**Cons**

- 🐛 Highlighter glitch
- 🐛 Incorrect error detection
- 🔋 Battery drain
- 🔋 Device heating up
- 🔋 Ads too frequent

**Commonly reported bugs**

- Crashes after latest update
- Notes color issue
- Handwriting recognition problems with new Apple Pencil

**Most requested features**

- Ability to input own puzzles
- More pen color options
- Customizable Apple Pencil gestures
- Multiple games in progress
- Undo/redo functionality
- Automatic note management
- Highlight notes of the same number
- Default note color option
- Puzzle timer and stats tracking

## Is Paper Sudoku safe?

Paper Sudoku: Classic & Killer appears safe based on user ratings. The AppsHunter Safety Score for Paper Sudoku is 96 out of 100. This assessment is based on 1,379 user ratings, with an App Store average of 4.8 out of 5. Of 1,366 App Store ratings, 97.4% point to a safe experience, 1.1% suggest some concerns, and 1.5% point to a risky experience.

## Is Paper Sudoku legit?

Paper Sudoku: Classic & Killer appears to be a legitimate app. The AppsHunter Legitimacy Score for Paper Sudoku is 100 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (10 of 103)

All indexed reviews: https://appshunter.io/ios/app/paper-sudoku-classic-and-killer/id1562442061/reviews.md

### 5/5 — Awesome app! Just 2 suggestions…

*2026-10-20*

Oct 2026 update: Still here and loving this app! Thanks to the developer for continuing to keep the app and options fresh!

Update: I wish I could give 6 stars. Hats off to the developer! The app was just updated and I saw that the pen colors were added and the backgrounds were fixed for dark mode! That was a real quick turnaround and it shows the care that goes into this app. I’ll be recommending it to my friends as well. 13/10!

really love how the app functions. It’s simple and I liked that there was a one time purchase rather than a subscription. Best app I’ve found for my Apple Pencil for sudoku! I would just suggest maybe 2 more pen colors? The white and blue can be hard to see. Finally, not all of the backgrounds show up which is disappointing because they look like they’d be cool! Otherwise, fantastic job developers.

**Developer response:** Thank you for your feedback. In v2.7 (out now) I’ve added some more pen colours and improved visibility of the blue pen in dark mode. The backgrounds should now be fixed 🙂
Glad you’re enjoying the app!

### 1/5 — Sucky Update

*2026-10-03, version 4.0.2*

The difficulty levels weren’t fixed with the new update. Please fix

### 1/5 — Better before

*2026-10-01, version 4.0.1*

This game was better before they upgraded it.  Even the “Very Easy” puzzles are too hard.  I’ll probably quit playing it.

### 1/5 — I don’t like the new update

*2026-09-30, version 4.0.1*

Bring the old version back

### 5/5 — A fun game

*2026-09-27, version 4.0.0*

This is a great app, but can someone tell me how to get rid if this killer cage thing and get back to the classic version? It got switched somehow and I can’t switch it back.

### 2/5 — iOS 27 breaks game

*2026-09-16, version 3.1*

Double tap a number, guess what your number you just filled in that is the only number that could go into that area on a new puzzle, meaning 1st or 2nd move.  Double tap that number doesn’t go green. Double tap another number, now your number that you just entered, now lights up green.  Double tap another number, guess what that last number is still green. Something broke!

### 5/5 — Absolutely love this game, only one thing could make it better

*2026-09-04*

This is hands down the best sudoku game I have ever played. Only one thing could make it better- I would happily pay for the game instead of getting ads. Maybe there could be the option for free w/ ads, or a fee for ad-free?

**Developer response:** I’m glad you’re enjoying my app, thank you for the feedback 😊 The option for removal of ads already exists in the settings page within the app - I will investigate if I need to make it more obvious!

### 5/5 — Fun

*2026-08-31*

Just started learning how to play on the iPad while using the Apple Pencil.  I enjoy playing the game this way.  One thing I noticed is that there isn’t enough room to make notations around the board (outside the borders) but I’m glad there is at least some room.

**Developer response:** Thanks for your feedback! In version 4 (just released) you can now turn on even more extra padding around the board in settings :)

### 5/5 — Apple Pencil support - yay!

*2026-08-29, version 3.1*

Simple and perfect!

### 5/5 — Wow

*2026-07-30, version 3.1*

This game is amazing I am able to write the numbers in my own handwriting with my apple pen. This game is great when you are on a long car ride with nothing else to do.

## Frequently asked questions about Paper Sudoku

### What is Paper Sudoku?

Paper Sudoku is a digital application designed to replicate the experience of playing Sudoku with pen and paper. It offers unlimited puzzles and provides the benefits of digital gameplay, such as auto-fill notes and error checking.

### What are the key features of Paper Sudoku?

Key features include unlimited puzzles, an experience that mimics writing on paper, optimized use with Apple Pencil, auto-fill notes, an interactive solver mode, support for pencil marks and highlighting, and a one-click error checking function.

### How much does Paper Sudoku cost?

The app is free to download and play, but it does offer in-app purchases. This means you can enjoy the core functionality for free, with optional purchases available for additional content or features.

### Is Paper Sudoku compatible with my device?

The description specifically mentions it's designed for use with Apple Pencil, suggesting it is compatible with Apple devices that support this accessory, such as iPads. Specific iOS version compatibility is not detailed.

### Who is Paper Sudoku for?

This app is ideal for individuals who enjoy playing Sudoku and appreciate the tactile feel of writing on paper. It's particularly suited for users with an Apple Pencil who want a digital yet authentic Sudoku experience.

## Version history (last 5 releases)

### 4.1.2 — 2026-10-21

SCAN A PUZZLE FROM PAPER
Point your iPad's camera at a puzzle in a book or newspaper and play it here. Tap Import puzzle on the home screen to start.

PEN AND PENCIL
Further refinement of pen and pencil appearance.

OTHER IMPROVEMENTS
Learn explains more killer sudoku moves, plus other small fixes from your feedback.

### 4.1.1 — 2026-10-15

PEN IMPROVEMENTS
Light, fast strokes no longer come out too thin, so your digits keep the pen thickness you've chosen.

ACCESSIBILITY
A new Board Contrast setting makes digits, notes and highlights easier to read, and can follow Increase Contrast. Paper Sudoku also respects Reduce Motion and Differentiate Without Colour, and the Learn panel grows with your text size.

OTHER IMPROVEMENTS
Other small fixes from your feedback. Keep it coming - it shapes every update.

### 4.1.0 — 2026-10-09

MORE LEARNING TECHNIQUES
More solving techniques that need no candidates, so you can learn to solve puzzles up to Medium difficulty without writing notes.

REFINED HANDWRITING RECOGNITION
Fixes some common recognition issues reported by players.

SCRIBBLE TO ERASE
Scratch out a cell with the pen tool to quickly erase it.

INLINE TOOL PALETTE
Squeeze Apple Pencil Pro to open a tool palette right beside the tip.

AND MANY MORE SMALL FIXES
Other small fixes from your feedback. Keep it coming - it shapes every update.

### 4.0.2 — 2026-10-01

BETTER DIFFICULTY GRADING
Puzzles are graded more accurately. The easier levels feel closer to how they used to, Expert is now a tougher challenge, and a new Diabolical level is there for when Expert isn't enough.

FASTER & SMOOTHER
Performance improvements throughout, so everything feels quicker and more responsive.

AND MORE
Other minor improvements based on your feedback. Keep the notes coming - they shape every update.

### 4.0.1 — 2026-09-28

This update adds some of the settings you've asked for since 4.0.

PEN AND NOTE THICKNESS
Choose how heavy your handwriting looks, with a live preview as you pick.

BOLD DIGITS
Show the puzzle's printed digits larger and bolder, for easier reading.

HOVER PREVIEW
The Apple Pencil hover preview is back, showing where your pen or eraser will land.

NOTES
Matching notes are highlighted in the colour you choose, and undo now puts your notes back exactly as they were.

ALSO
Writing uses less battery, and you can attach up to five screenshots when you send feedback.

Thank you for playing, and for the feedback that shaped this update.

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## More apps by Tobeas Brennan

- [Sudoku Pro ~ classic puzzles](https://appshunter.io/ios/app/sudoku-pro-classic-puzzles/id1035112134)
- [500 Scorer](https://appshunter.io/ios/app/500-scorer/id1554609969)

All apps by Tobeas Brennan: https://appshunter.io/developer/1454513051

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-07.*