Clue Formula vs DuoDom
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
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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.
DuoDom
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DuoDom — the laid-back sliding puzzle in pixel-art retro style. A board fills with stones marked 1 to 6. Slide them across the empty squares so that two matching stones land right next to each other — they vanish as a pair. Clear the whole board to win. HOW TO PLAY • Tap a stone to select it. • Tap an empty neighbouring square to slide the stone there. • When two matching stones meet edge to edge, they disappear. • Clear the entire board — level done. Every puzzle is guaranteed solvable — a built-in solver verifies each level before you see it. No frustration, no dead ends. FEATURES • Hundreds of solver-checked puzzles • Pixel-art graphics in lovingly crafted retro style • Smooth animations at 60 FPS • Per-level highscores — how few moves can you do it in? • Trophy system for special achievements • Built-in tutorial • Pause with settings for volume and language • Synthesized sound effects straight from the game • Works in any screen size, portrait and landscape 20 LANGUAGES DuoDom auto-detects your device language and lets you switch live anytime: Deutsch, English, Français, Español, Italiano, Português, Nederlands, Polski, Čeština, Slovenčina, Magyar, Română, Türkçe, Русский, Українська, Ελληνικά, Svenska, Dansk, 日本語, 中文. Perfect for a coffee break, a train ride, or winding down after work. Slide, combine, win. DuoDom — side by side, gone for good.
Screenshots
Verdict
The clearest difference is in-app purchases: DuoDom at none against Clue Formula's 2. DuoDom also leads on ads (none vs shown). Clue Formula's advantage is update cadence (every 4 days vs monthly). On price, device support and iOS requirement 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. DuoDom asks for nothing beyond the download.
Clue Formula ships an update every 4 days, DuoDom monthly. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.
| Parameter | Clue Formula | DuoDom |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 4 days — better | Monthly |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 22 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | x2line.com LLC | Josef Sejrek |
In-app purchases
Clue Formula
- Hint$0.99
- Shuffle$0.99
DuoDom
No in-app purchases









