Report updated Apr 3, 2026
Fill Puzzle - One Line Game
v1.0.7Casual mobile gamers looking for simple, addictive, and time-consuming brain-teasing puzzles.
What Is Fill Puzzle - One Line Game?
Launched Jun 26, 2018
Updated Jun 2019
What does it look like?
What are the key features?
Core gameplay requiring users to fill all squares in a grid using a single continuous stroke without lifting their finger.
Extensive collection of over 200,000 levels to provide long-term engagement.
Automatic level reset if the user lifts their finger or fails to complete the path correctly.
What do users think? iIndependent intel reports to help builders create better apps or enhance existing ones. Still in beta, accuracy and relevancy get better every day. For informational purposes only.
Gathering public signals...
Sentiment analysis will be available once enough user reviews are collected.
What are the pros and cons?
Pros
- Massive content depth (200,000+ levels)
- Simple and intuitive core mechanic
- Respectable 4.0+ star rating
Cons
- Lack of updates since 2019
- No explicit IAP for ad-removal
- Minimal social and brand presence
What is the market outlook?
Growth Opportunities
- Modernize UI/UX for current devices
- Introduce daily challenges to boost retention
- Implement ad-free premium tiers
Market Threats
- Dominant market leaders with higher update frequency
- OS incompatibility risks due to age
- Newer, high-polish competitors in the path-drawing space
Who competes with Fill Puzzle - One Line Game?
The Nemesis
Why it's a threat
- +
ASMR Experience
- +
Massive scale with over 1M ratings
Contenders
Uses a similar 'fill the board' logic through line connection, appealing to the same puzzle-solving mindset.
Focuses on the 'one touch' drawing constraint with a variety of grid-based and shape-based challenges.
Massive Level Library
Peers
The dominant grid-filling puzzle game; while it uses pairs, it shares the 'fill every square' objective.
Extensive Level Library
A major player in the grid-filling space that captures the same casual 'brain teaser' audience.
Sudoku-Block Hybrid Gameplay
Block! Hexa Puzzle™
★4.5 (43K)BitMango, Inc.
Shares the core satisfaction of filling a defined space completely, though using blocks instead of lines.
Shares the core satisfaction of filling a defined space completely, though using blocks instead of lines.
New Kids on the Block
While 3D, it capitalizes on the 'filling' trend and has massive growth momentum in the puzzle category.
Extensive Puzzle Library
Railbound
★4.8 (117)Afterburn Lukasz Spierewka
An innovative path-drawing puzzle that adds thematic depth to the 'one continuous line' concept.
An innovative path-drawing puzzle that adds thematic depth to the 'one continuous line' concept.
What are the key takeaways?
Fill Puzzle - One Line Game is a divisive games app that is completely free. With a 4.0/5 rating from 64 reviews, it receives mixed feedback from users.
Best for: Casual mobile gamers looking for simple, addictive, and time-consuming brain-teasing puzzles.
How much does it cost?
Model: free
The app appears to be a free-to-play title likely relying on ad-based monetization, as there is no mention of IAPs or subscriptions in the current metadata.