Fill - one-line puzzle game v8.6.0

Gamincat

Contains ads • In-app purchases

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About this app

Developer Description

Sharpen your mind with a one-line block brain training puzzle game.

Sharpen your mind with a connect-the-block-style one-line brain training puzzle game.
A simple but addictive one-line puzzle game that’s completely free to play.

Your brain becomes more active the more you play.
During your commute, before you sleep… enjoy downtime with brain training.

The rules are extremely simple.
Just fill in all of the blocks using only one line.

Use hints for puzzles that are too hard to solve.
Hints are also free, of course.

4 levels of difficulty.
A whopping 2,000 puzzles.
Don’t get too cozy—the puzzles get harder as you go along.

One-line puzzles are mathematical problems with origins in the early 18th century. First posed in Königsberg, the original puzzle revolved around the town’s Pregel River.
Mathematical thinking is said to increase work efficiency and prevent aging.
Whether math is your bane or your forte, be sure to give this game a try.
You’re sure to get hooked on these puzzles!

What's New

Ad SDK update
Game Improvements

In-app purchases

$0.99 - $9.99 per item

Version Information

Version: 8.6.0
Downloads: 5M+
Updated on: Oct 21, 2025
Released: Apr 27, 2016
Requires: Android 6.0

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Fill - one-line puzzle game users say on Google Play

★★★★★

Amani Rupia

It's nice. It's a good time waster and there are enough levels in the game to keep people on it for quite a bit.

★★★★

Vicky Clement

Great game but because we play on a chromebook its a bit difficult getting back to the level you were last at as there is no scroll bar. Please can you add one?!

★★★

Andy Do

It's a simple time killer that takes a a tiny bit of thinking. In the early/easier levels you'll definitely be spending more time viewing advertisements than playing (Definitely one of the factors that turned me away, but the developers got to make money somehow). The gameplay itself is pretty straight forward and quite repetitive, but some people enjoy that. You can expect an advertisement every 2-3 levels. I personally found quite dull with the puzzles providing lack of contrast or difficulty.

★★

Ryan K

Great concept of a game. Although the gameplay gets a bit repetitive after a while, I really enjoyed the puzzle aspect. I honestly wasn't a huge fan of the game spamming inappropriate ads after every few levels. You must have an internet connection to play the game because the ads themself require internet and must run for the game to work. This is a great game unfortunately ruined by ads. I would pay to remove the ads but the price seems a little bit steep.

★

Christian Johansen

The concept for a game like this is great! But the execution of this leaves a lot to be desired. It started out easy, as to be expected but it never got harder. I played until level 50 and the difficulty was constant, and the patterns to solve the puzzles are repetative and i swear some of them a reused a few times. Also, there are way too many ads, like an unskippable 30 second ad every 3 puzzles or something. They're also not normal ads, they're those choose your adventure elsagate pee in pool