What's New

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

* Add coin bonus
* Improve performance
* Minor modification

Please continue your favors toward "Fill - one-line puzzle game" in the future.

App Description

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!

iPhone Screenshots

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iPad Screenshots

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App Changes

  • July 05, 2016 Initial release
  • August 01, 2016 New version 1.0.4
  • November 09, 2016 New version 1.0.7
  • May 26, 2018 New version 3.0.2
  • August 05, 2018 New version 3.1.1
  • November 28, 2018 New version 4.3.0