A brain-training puzzle in which you draw 1 line, that will sharpen your wits.
In this free-to-play puzzle game, you merely have to draw one line. It is deceptively simple, yet profoundly deep.
Play through the extensive stages, sharpening your wits as you have fun.

A brain-training puzzle game that activates your mind as you play.
When you've got a spare moment, on your daily commute, or before going to bed, why not experience what it feels like to activate you mind?

How to play:
There is only one rule:
"Connect all the points with just one line."
It doesn't matter where you start.

There are some fiendishly tricky, complicated puzzles among the large number of stages.
When you get stuck, make use of a hint.

There are 15 levels, and a total of 750 stages.
At first, it starts off with simple shapes, but each time your level increases, the number of lines increases, and it gets more and more complicated.
You might think it's too easy early on.
However, clearing the simple stages is also important.
The hints to clearing the later, more complicated stages can all be found scattered through the simple stages.

Some unique types of line, such as "one way lines" and "overlapping lines", can also be found throughout the stages.
These special lines will encourage your imagination.

Use this chance to activate your mind as you play, by trying to solve this free-to-play brain-training puzzle game.
You're sure to get hooked!!

What's New

Version 1.6.1

Thank you for always using it.
We have carried out the following update.

* Improve performance
* Minor modification

Please continue your favors toward "1LINE - one-stroke puzzle game" in the future.

Customer Reviews

4.7 out of 5

10.6K Ratings

10.6K Ratings



I love this game for many reasons well I should tell you those reasons because it is challenging but not to hard because I love challenging games but not to challenging but this is perfect I also like it because it gives me hints and I don’t have to buy them with money another reasons is when I ask for a hint then it gives me 1,2,3 and then if I get the shape wrong and then I start over then it still says 1,2,3 so I don’t forget where they where because I think I forget a lot and I also think I have memory problems but my mom says and I quote “ no honey you are fine “ but you know I love this game and it is the best game to play on the airplane or in the car or just when you are waiting or you are bored so if you are looking for a fun, challenging, creative game then this is the game that you should get😜.


Kaylee :-)

I love this game sooo much! It’s so addictive! I play it at school, on long road trips, on airplanes, or even just at home when I’m bored. I love it because it gives you hints that you don’t have to pay ACTUAL money for, it’s so awesome!!! It’s also not that hard. If you don’t really like challenging games this is the game for you, but if you like challenging games this is the game for you as well. It’s kind of weird if you think about it. This game is good for ANY type of person. My grandma even plays it and she’s on a higher level than me!!! It’s so fun and I definitely recommend this game. Also, one more thing, even kids as little as 3 yrs old can play this game! My little brother plays this game and just turned 3 yrs old in November! So this game is basically good for 3+. LOVE IT SO MUCH AND I DON'T THINK THIS GAME HAS ANY ISSUES OR BUGS TO BE FIXED!!! GREAT JOB!!! 👏🏻👏🏻

Really fun, challenging!


Being a person who plays only brain challenging, thinking required, critical thinking, and purposeful games, this one is great. Always looking for a game to challenge and maintain my brain fitness to ward off early stumbled upon this game and I’m totally impressed. Buy the ad removal as your play is MORE fluid and you don’t get distracted by silly ads. Well worth the $2.99 to remove them.
I also purchased another game by this creator before I even played one game. I purchased the block un block game by them. My name fir it, not theirs. Check it out as it is just as challenging and motivating as well.
WARNING: very hard to put down, keeps you wanting the next puzzle.
Looking forward to more games by this creator. Thank. You!


110.1 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Japanese
Age Rating
Rated 4+
© GameStart
In-App Purchases
  1. 5 Hints $0.99
  2. Remove ADs $1.99
  3. 30 Hints $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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