Clue Formula vs Shape Sudoku
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Clue Formula
Engage in a 3D Mahjong puzzle game featuring IQ-test style tiles. Match selectable pairs to clear levels, with increasing difficulty as you progress. Utilize hints and shuffles to aid your gameplay and compete on leaderboards.
- 3D Mahjong puzzle gameplay
- IQ-test style tiles
- Layered 3D levels
- Hint and shuffle options
- Leaderboard competition
- VoiceOver accessibility
Read full descriptionHide full description
Clue Formula is a 3D Mahjong puzzle with IQ-test style tiles and pattern-matching challenges. Your goal is to complete all levels. In each level, remove all tiles by selecting matching pairs. Not every matching tile can be selected. A tile is selectable only when it is positioned at the end of a row - when there is no neighboring tile on at least one side (left or right) within the same layer. To complete a level, you need to find matching pairs where both tiles are selectable. Each new level becomes more challenging as you advance. A hint can show all selectable matching pairs. A shuffle can rearrange the remaining tiles and help you continue the level. Key Features: 3D Mahjong Puzzle: Match selectable pairs and clear each level. IQ-Test Style Tiles: Match tiles using shapes and symbols. Layered 3D Levels: Look through rows and layers to find selectable matching pairs. Leaderboards: Complete levels and compete for a place on the leaderboards. Accessibility and Device Support: Clue Formula is fully playable with VoiceOver. Clue Formula is fully supported on Mac. Extra hints and extra shuffles are available for purchase.
Shape Sudoku
This logic puzzle game uses shapes instead of numbers, making it accessible for those with dyscalculia, young learners, or anyone who prefers visual patterns. Enjoy daily challenges with multiple difficulty levels, helpful tools, and full accessibility features.
- Shape-based Sudoku logic
- Daily puzzles
- Five difficulty levels
- Notes, undo, and hints
- Colorblind-friendly design
- Full VoiceOver support
- No ads or tracking
Read full descriptionHide full description
form9 is sudoku, played with shapes. The same 9×9 logic you know — but every cell holds one of nine quiet silhouettes instead of a digit. Nothing to read, nothing to count — just pattern and logic. That makes it a natural fit for people with dyscalculia, kids still learning their numbers, language learners, and anyone who simply thinks in shapes. • A fresh daily puzzle, with a streak to keep • Five difficulties — Easy, Medium, Hard, Expert, and Master • Notes, undo, hints, and gentle error highlighting • Colorblind-friendly by design — shapes carry the meaning, not colors. Nothing to toggle. • Full VoiceOver support — every shape has a clear spoken name • Optional color-hint mode for a redundant cue • Reduce Motion respected • No ads. No tracking. Ever. form9 Pro (one-time purchase) unlocks: • Expert & Master difficulty • Statistics — best times, completions, hint-free streaks • The daily archive — replay any past puzzle Made by a solo developer who believes a good logic puzzle deserves a calm, quiet home. Terms of Use: https://form9sudoku.app/terms/ Privacy Policy: https://form9sudoku.app/privacy/
Screenshots
Verdict
The clearest difference is review sentiment: Clue Formula at 100% against Shape Sudoku's 0%. Clue Formula also leads on update cadence (every 3 days vs every 6 days) and device support (4 vs 1). Shape Sudoku's advantage is ads (none vs shown). On price, in-app purchases and monetization model 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. Clue Formula sells 2 one-off in-app purchases and Shape Sudoku sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Clue Formula ships an update every 3 days, Shape Sudoku every 6 days. The most recent releases landed on September 1, 2026 and September 6, 2026 respectively.
| Parameter | Clue Formula | Shape Sudoku |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 days — better | Every 6 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 22 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | x2line.com LLC | Agata Raap |
Customer experience
Clue Formula
Shape Sudoku
In-app purchases
Clue Formula
- Hint$0.99
- Shuffle$0.99
Shape Sudoku
- form9+ Lifelong$5.69
