Fifteen - 15 is a minimalist sliding puzzle game that prioritizes a pure, ad-free experience for logic enthusiasts and speedrunners. It differentiates itself through deep technical customization, including grid sizes up to 10x10 and a scramble editor, positioning it as a high-fidelity utility rather than a casual toy. While the Android version remains actively maintained as of April 2026, the app relies on its non-monetized model to maintain a 'Thrilled' user base in a market dominated by high-velocity, ad-supported competitors.
The App DNA
What makes this app unique?
For Puzzle enthusiasts and logic game players who appreciate deep customization, performance tracking, and an ad-free, minimalist gaming environment.
What does it look like?
Key features
Offers classic, snake, and spiral puzzle types for varied gameplay
Tracks solve history and allows users to review their solutions for speedrunning analysis
Allows users to edit or create custom puzzle scrambles
Supports board sizes ranging from 3x3 up to 10x10
How much does it cost?
The app follows a non-monetized, hobbyist-driven model, leveraging the absence of ads as its primary user acquisition and retention lever.
Velocity
Dormant developmentUX improvementsShow more...
Development is extremely sporadic, with an eight-year gap between the initial release and the most recent update. The single feature addition in 2026 does not indicate a consistent development cadence or active roadmap. The app appears to be in maintenance mode or abandoned, as there is no evidence of sustained feature delivery or regular iteration.
Who built it?
TEDRA SOFT SRL
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Enigmas e adivinhasUser Sentiment
What do users think recently?
Recent user voice shows a thrilled sentiment. Users appreciate ad-free experience and fluid controls & performance, but report input & ui glitches.
How are ratings & reviews evolving?
What users say, by theme
- Ad-Free Experience
- Fluid Controls & Performance
Unlock 1 more frustration theme, each backed by review evidence.
Access the full report for freeCompetition
Competitive landscape for Fifteen - 15
How's the Games market?
The rivals identified
By Mrudul Babariya
The most direct functional rival, offering the exact same sliding-tile core loop but with modern feature parity and higher update velocity.
- Offers variable grid complexities (3x3 up to 8x8) whereas this app is limited to the standard 15-tile format.
- Includes a 'Challenge Mode' that introduces time limits, shifting the game from a casual toy to a competitive experience.
- Provides a 'Hint' and 'Undo' system to assist users, addressing the frustration of getting stuck in the classic 15-puzzle layout.
Unlock the deeper market read.
Access the full report for freeThe Analyst's Read
Key takeaways for Fifteen - 15
Where is it heading?
- v1.7.0 updated April 2026 — indicates active feature investment, not maintenance mode.
- Thrilled user base regarding ad-free experience — provides a strong moat against commercial rivals.
- Emerging reports of input lag — a critical risk for a speedrunning-focused app.
The SWOT
- Strictly ad-free model driving high user loyalty
- Deep customization (3x3 to 10x10 grids)
- Advanced speedrunning tools like Replays and Scramble Editor
- Implement global leaderboards to engage the speedrunning community
- Introduce 'Zen' branding to compete with modern block-puzzle trends
- Add Hint/Undo systems to improve accessibility for casual users
Next best moves
Resolve input lag and UI responsiveness issues
+ 2 more prioritized movesFeature gaps
Hint and Undo systems (available in Classic Number Game - Numpuzzle) +3
Bottom line
If I were the PM, I would prioritize fixing the input lag to maintain the app's 'gold standard' status for speedrunners while introducing a leaderboard to drive organic competition. The ad-free model is a massive competitive advantage, but technical stability and a lack of social hooks are the primary risks to long-term retention.
Unlock 3 critical frictions, 2 market threats, 2 more prioritized moves and the analyst’s take.
Access the full report for freeFAQ
Is this the best 15-puzzle app for speedrunning?
How does this compare to other free sliding puzzles?
Does this app have intrusive ads?
Is there a version of this with levels and progression?
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