Notation Chess vs Sudoku
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Notation Chess
Practice chess visualization and play games using only standard notation, directly from your Apple Watch. This app offers adjustable difficulty and engine settings, with the ability to review moves and peek at the board when needed.
- Play chess on Apple Watch
- Practice with standard chess notation
- Adjustable difficulty and engine settings
- Review move history
- Peek at the board feature
- Undo moves
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Play notation-first chess on the go, directly from your Apple Watch. Notation Chess is designed for players who want to practice visualization and play without relying on a full board view. Choose your color and difficulty, select moves using standard chess notation, and review your move history as the game progresses. The app is powered by the lightweight Chal chess engine, with adjustable search depth and move variety settings. When you need a quick visual reference, use Peek at Board to check the current position. You can also undo moves and start a new game at any time. Features - Play chess on the go from Apple Watch - Practice using standard chess notation - Powered by the Chal chess engine - Choose your color and difficulty level - Review the complete move history - Peek at the board when needed - Undo moves - Adjust engine search depth and move variety
Sudoku
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Make room for focus with Sudoku - a quiet puzzle break, wherever you are. Play every puzzle offline on iPhone and iPad. No ads, no account required, and no connection needed to keep playing. FIND YOUR CHALLENGE Explore 100 difficulty levels, all available from the start. Enjoy an easy break or take on a more demanding board. PLAY AT YOUR PACE Use pencil notes, undo moves, erase entries and ask for hints. There’s no countdown or mistake limit. Your progress saves automatically, so you can pause and return whenever you like. MAKE IT YOURS Choose from six colour themes with light and dark appearances. Adjust mistake highlighting, matching-number highlights and haptic feedback. SEE YOUR PROGRESS Track completed puzzles, streaks, play time and performance by difficulty. Statistics distinguish assisted completions from puzzles solved without hints. KEEP YOUR PUZZLE CLOSE See your session’s status with Live Activities. Use Siri and Shortcuts to resume, pause, start a puzzle or check your progress. Set an optional daily reminder when you’d like a little encouragement. CONNECT WHEN YOU CHOOSE Sign in to Game Center to share competitive progress and earn achievements when online. Your puzzles and local statistics remain available offline. A little focus. A satisfying challenge. One square at a time.
Screenshots
Verdict
The clearest difference is iOS requirement: Notation Chess at 13.0 against Sudoku's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Notation Chess | Sudoku |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch, Vision Pro — better |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 2 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Zheng Liang | Azizbek Asadov |
In-app purchases
Notation Chess
No in-app purchases
Sudoku
No in-app purchases









