• Fill - one-line puzzle game 1
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Fill - one-line 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!
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!

物理の法則にもとづいてボールをブラックホールに落としてください。

暇つぶしに最適な激ムズ脳トレ!アクションパズルゲーム!

Category : Puzzle

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Reviews (28)

Fla. M. D. S. Nov 19, 2018     

The game itself is ok (how could it not?) But it is such a grind to advance... You have to complete HUNDREDS of super easy puzzle before even hoping to get something more challenging. It is the 1st time I see such microtransaction technique: pay to have a challenge... Or grind through thousand of super easy puzzle and waste your time...

Sto. Apr 21, 2022     

After the first 5 levels, you get 20 seconds of ads after every level. There seems to be about a 20 sec window of cool down between ads so if you complete two levels within 20 seconds, you're basically guaranteed to hit another ad. If it takes longer than 20 seconds to beat a level, you will get an ad no matter what, and it's about 7 seconds of ads, then followed by 5-10 seconds to close out of it. This game forces you to watch ads as much as you're allowed to play.

Leo. B. Dec 10, 2018     

Thw controls worked fine. The graphics were simple and worked fine with the game. It was just too easy, and after seeing the repetitiveness of the puzzles you can't see much else while playing. Same puzzle diffrent starting point was a huge part of it. My excitement for the game was high with the sheer quantity of levels, but dwindled after noticing this wasn't a labyrinth of puzzles, but a hole that just got more and more boring the deeper you go. Its fin for about 30 minutes. Get it on a lunch break and forget about it.

fin. Jan 13, 2019     

I wouldn't say "Dont waste your time" or "dont play this game because___" or anything, the game is still able to be played and enjoyed but it's just too easy. I dont see any ads and I didn't buy an Ad Blocker or something. The puzzles are just too easy and repetitive, you start by filling the areas with two spaces to get out and end at the area with 1 space.

Min. N. Mar 28, 2019     

Game is fun, pretty easy. There are somethings that a bit annoy me like when you click to get some reward, sometimes it said sorry we had no video available. There are many ads in the game too. Last, I finished 25 levels of the game, but I didnt see any reward screen, it's a bit sad as a feeling of a player that you spend time to play the game then you didnt get anything. Anyway, good job and hope you improve the game more.

Bra. C. Jan 5, 2019     

I went through 200 levels and they all felt very similar. It has a painfully slow difficulty ramp. This by itself does not make it a bad game, however all of the puzzles seems to require the same two or three tricks to solve them. it does not challenge you to come up with new ideas, it simply teaches you to mindlessly fill out shapes. Perhaps the difficulty issue could be solved by allowing players to move to harder levels quickly, but it forces you to play through hundreds of trivial levels.

Soc. T. Dec 13, 2018     

This game was okay for the first five-ten levels. Until suddenly it decided not to detect my movements, then completely close out of the game. Then setting me back a level or two. This is really annoying, as I was looking forward to playing it. I hope it's just a bug and can be fixed.

Lin. Feb 20, 2019     

It works, but not well. The line is slow and glitchy, and adverts take forever to load. The amount of pointers towards options like hints, micritransactions, and free rewards make the game look a lot like it was only made to make money. Not fun or interesting enough to make it worth the time spent on ads.

Twi. M. Dec 21, 2018     

This game is pretty fun and the objective is easy: Fill the whole space with a line. I think the look and feel is nice, though there are some minor bugs: when given coins every 5-10 or so levels, it seems to always say something along the lines of +50 coins when it gives around 200-250 and the response time is pretty slow. Aside from that, its a pretty great game ^^

Rya. K. Feb 28, 2021     

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.

mat. o. Jul 24, 2020     

Fun little thing but WAY TOO MANY ADS. You can't even begin to get a rhythm here because there's a full length ad after every game. I understand that the designer is in this for a buck, but when it ruins the flow of the game, the game itself is ruined. At least give us the option to put a buck forward to stop the ads. My two cents.

Mo. P. Apr 7, 2019     

I played exactly 504 levels before I called it a day and uninstalled. As many have already said the levels become waaaay to repetitive and when you're going through each level in 20-30 seconds (even that is when you're on a 'tough" one) you know you're not being challenged. Ads also rife in this every few levels is an ad, I've come to accept ads somewhat as it's pretty much expected but the constant bombardment is a bit much. Overall it's too easy, too many ads, time to uninstall.

C. .. Apr 25, 2022     

I usually go by reviews before downloading, this game is free, so expect a lot of ads, but they're reasonable and not like the other false advertising games. Plus playing it as an offline game solves the issue. Would recommend if you're bored and got no other games to play.

Chr. J. Mar 13, 2021     

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

Tim. C. Dec 21, 2018     

Full of ads. It does what it does perfecty, but it constantly ushers you towards getting you to click that "Watch ads" button. I would stay away from this game if I were you. Also, you could probably code your own version of this in less than a day. The second thing is that this type of puzzle....... Needs no thinking at all. Unless you're a complete idiot, this should be trivial.

Rob. D. Nov 8, 2018     

Its not a bad game but if your really smart and you want a challenge its just too long of a wait to get it. I went through 400 levels in 2 days. At this point it would have been better if i could have just selected the difficulty rather then wasting my time. Im not saying its not possibly tough later i just dont have the patience to go through 600 levels to get to it. Theres no motivation to prove my intelligence.

Kyl. C. Dec 29, 2018     

I noticed within the first 100 levels that most of them just kept repeating, but the layout was just turned sideways. I thought in the next few hundreds that would change, but after reaching 4-50 in about an hour of doing generally the same puzzles it was getting boring. nothing changed the entire time.

Mit. L. Dec 11, 2018     

Great for kids probably but the early levels kind of felt like an insult to intelligence. Wouldn't be too bad if harder difficulty levels were immediately available but I'm not going to wade through hundreds of simple"puzzles" to get to something that actually takes some thought to solve. Too much of a chore. Good idea, poor implementation

sog. t. Mar 13, 2019     

I love the game, its quite fun, and its a great time passer for when you're bored. Theres is one thing i would like to change, the music. Well, not necessarily the music, but the option to play it. It would be very nice if i had the option of turning off the music, but keeping the clicking noise it makes.

A. G. u. Mar 1, 2019     

AWSOME... relaxing and fun game... i love how some levels just impossible. Then other levels are pretty easy and can be done in one or few attempts also this game is pretty simple so it's easy to tell what's going on I recommend you get this game because it's a very good time to her very relaxing and I'll get you in a relaxed state other than that controls fine since all you really have to do is just drive them there are sometimes where you have to use a hint but that's O.K

Blo. Jan 23, 2019     

great game i love it but wish it had a night mode. its a simple game. if your trying to sleep but your brain is to active play this. thats what i do. I also wish you could spend your coins on other stuff other then hints. make the game fun change the game a bit. it might not work well but do a multiplayer see who finishes faster or make your own levels for other people around the world can try.

alw. K. Jan 16, 2019     

I was extremely happy playing this game the first few levels! this was just the kind of game I was looking for! HOWEVER, after the first few levels I was EXTREMELY Disappointed to find they were just repeating the same puzzles level after level! I actually thought I was crazy until I screenshoted a few and compared. turns out I'm not crazy! so, although I was on level 6 I was given the same puzzles that were on level 1. I wish they woluld have done this differently because I did enjoy playing

Ide. Dec 16, 2020     

Perfect control, minimalist graphics. I just don't like how often the pop-up ads occurred.. Every five stages or like in every 1 minute in beginer level, gave up before "challenging" level.. A lot of stages to be played yet seem minor changes in each, virtually repeatative.

Rya. S. Sep 25, 2018     

The style isn't too professional with low quality sounds/sounds becoming repetitive with little menu inconsistencies, but other than that, gameplay is great, puzzles are great, ads are non intrusive and it somehow keeps me attentive. What more could you ask?

Kel. K. Apr 29, 2019     

too many ad, i normally spend 5 to 10 second for each puzzle, and every few puzzle there is an ad, is like almost every 2 minutes i have to watch an ad. most of the puzzle are too sample, but i have to finish so many simple puzzle for higher level which are not so much harder. why not i can just directly play the harder one.

Cla. A. Sep 21, 2019     

It's a really good game to pass time by, but for me i think some of the levels are repeating and too easy. I think, try coming up with harder puzzles to solve,so it will be more fun to play, since this is a puzzle game

Mic. N. Mar 1, 2019     

ok game, it starts off mind numbing and is very slow to advance. By lvl 20 it is ok... but an ad (the Same Ad!) after Every Single Level, five levels in a row made me quit. I understand the need for ads, but I spent as much time in ads as playing the game... no thanks.

Vic. R. Oct 8, 2018     

I have the feeling that a lot of levels are repeated. Moreover, sometimes, ads are played twice before being able to click again in the app, it's faster to close the app and reopen it than watching them.