Comparison

Fill One Line 3D vs Eulerian

Price, ratings, monetisation and update history for both games, side by side โ€” with what reviewers say about each.

Head to head
About

Fill One Line 3D

Features
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Fill Line Game on Lagged Fill up the empty spaces/flow free fill to complete each level. You can not overlap any spaces you have already filled, so think ahead so that you can complete each level with a single line. The levels get progressively harder so try to relax and solve each puzzle. Can you complete all 36 levels in this fun online puzzle game? How to play: Click or tap and drag to fill the empty spaces. It's time to sharpen your mind with a 'connect the block' style one line brain training puzzle game. Plan your moves carefully and think about how you fill the lines. Good luck! Sharpen your mind with a connect-the-block-style one-line brain training puzzle game. A simple but addictive one-line puzzle game thatโ€™s completely free to play. Free Flow - Fill One Line is puzzle game. Your mission is fill the all blocks on the screen by only one line Your brain becomes more active the more you play. During your commute, before you sleepโ€ฆ enjoy downtime with brain training. Summary: Free Flow is A simple game but addictive. Free Flow game is free to play. "Relax", "Focus", Training Your brain. Free Flow game will stimulate your brain each time you play Energizing your brain: + During your free time, + During your commute, + Before you sleep + Enjoy free time with Flow brain training. Your brain becomes more active the more you play. During your commute, before you sleepโ€ฆ enjoy downtime with brain training. All you need to be master of wood puzzle one line fill :fill the wooden puzzle in one line ,can fill all the blocks using only one line? Chalenge yourself and sharp your mind by playing oneline puzzle in wooden style . don't be crasy withthe most difficulte puzzles remember you can always use hint for complected levels .to passe them easly. Wood Puzzle Fill One Line Puzzle-Fill One line wood freatures : - Fill One Line Puzzle: levels to chose from . - Fill One Line Puzzle :from begeiner to master. - Fill One Line Puzzle: a gameplay that suits kids and adults and even granny. - Fill One Line Puzzle:more than 20 free hints to use wheneyou are stuck in any level.

About

Eulerian

Features
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Trace every edge of the graph without retracing your steps โ€” sounds simple, right? Eulerian is a minimalist puzzle game inspired by one of mathematics' most elegant problems: the Eulerian path. Each level presents a hand-drawn graph on a notebook page. Your goal is to traverse every edge exactly once. No repeats. No leftovers. START SIMPLE, GET HOOKED Begin with easy graphs and work your way through 2000+ handcrafted levels that grow increasingly complex. What starts as a relaxing pastime quickly becomes an addictive challenge. ENDLESS MODE Finished the main levels? Jump into Endless mode with procedurally generated puzzles that never run out. Four difficulty modes to test your limits. BEAUTIFUL NOTEBOOK AESTHETIC Every puzzle feels like it was sketched by hand on a real notebook page. Unlock premium themes to customize your experience. FEATURES - 2000+ handcrafted puzzle levels across 10 packs - Endless mode with 4 difficulty settings - Hints when you're stuck - Star rating system based on speed and efficiency - Calming ambient soundtrack - Multiple notebook themes to unlock - No internet required โ€” play anywhere Based on a problem first posed by mathematician Leonhard Euler in 1736, Eulerian brings centuries-old graph theory to your fingertips in a beautiful, approachable package. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Fill One Line 3D4 screens
Eulerian4 screens

Verdict

The call

The clearest difference is in-app purchases: Fill One Line 3D at none against Eulerian's 9. Fill One Line 3D also leads on iOS requirement (12.0 vs 17.0). Eulerian's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 22 months). On price and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Eulerian sells 9 in-app purchases, starting at $3.99 per month. Fill One Line 3D asks for nothing beyond the download.

UpkeepUpdate frequency

Fill One Line 3D ships an update every 22 months, Eulerian every 3 weeks. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

Scorecard4 real differences ยท 2 level
Fill One Line 3D versus Eulerian: the parameters behind the verdict, then further details
ParameterFill One Line 3DEulerian
PriceFreeFree
Update frequencyEvery 22 monthsEvery 3 weeks โ€” better
AdsYesNo โ€” better
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS12.0 โ€” better17.0
Further details โ€” not scored
Size63 MB19 MB
Age rating4+4+
DeveloperPhuong TaMadhav Dogra

In-app purchases

None

Fill One Line 3D

No in-app purchases

9 purchases

Eulerian

Subscriptions1
  • Endless Monthly$3.991 Month
One-time8
  • 5 Hints$0.99
  • 15 Hints$1.99
  • All Premium Themes$3.99
Show 5 more
  • Double Coins$4.99
  • Remove Ads$4.99
  • 50 Hints$4.99
  • 150 Hints$9.99
  • 500 Hints$19.99

Questions

Is Fill One Line 3D free?
Fill One Line 3D is free to download, with no in-app purchases.
Is Eulerian free?
Eulerian is free to download, with in-app purchases available.
Do Fill One Line 3D or Eulerian have ads?
Fill One Line 3D shows ads; Eulerian does not.
Which is updated more often, Fill One Line 3D or Eulerian?
Fill One Line 3D ships an update every 22 months, and Eulerian every 3 weeks. Most recently, Fill One Line 3D was updated on November 7, 2026 and Eulerian on November 9, 2026.

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