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By Prolog Inc.

This app is only available on the App Store for iOS devices.


Protangle is a smart puzzle game where you have to tactfully reorganize some jumbled lines so that no line crosses another line.

Lite version has all features of full version, but shows commercials.

If you love to solve analytic and visual puzzles, Protangle is for you. You will have to visualize a lot, which will increase your analytical skills and critical thinking. Also, it is really fun to solve each of the problems.

The screen will show several balls scattered across the screen, with many lines connecting the balls. These lines crisscross the screen. You can move a ball by touching it, and by that the lines connected to that ball change positions. The objective of the game is to arrange the balls so that there are no crossings.

The lines that have some crossing are marked with bright white, while the ones with no crossings are marked with black. At first, most lines are marked as white. As you progress with the puzzle, more and more lines will be marked as black. At the end, there will be no white lines, denoting a solution.

Tip: Generally, you make a move which reduces number of white lines. All the time you drag a ball, observe the lines for a situation which is better than the current one. Try to keep balls having more lines with them at the center of the screen and balls having fewer lines near the sides of the screen.

There are two modes of game play i.e. Normal Mode and Challenge Mode. In Normal Mode, you will have as much time as you like to discover a solution. Point distribution depends solely on fast and quick solution. This mode is actually a practice ground for Challenge Mode.

In Challenge Mode, you will have a certain objective to accomplish: you have to solve the puzzle within a limited time. The hardness of the challenge is determined according to the game level.

The Classic Mode has 42 levels where each level contains a graph to solve with no time constraint. Challenge Mode has a time constraint.

In Challenge Mode, you will get time bonus which is calculated as following:
Level Point =10 + Level Number *10
Bonus = Level Number * Time Saved
And Total Point = Level Point + Bonus

In leader board, you can submit your score to see your rank among all players in the world. Also, it will display the top 10 users with their scores.

You can send feedback, report bug or send suggestions to us using Send Feedback option. A dedicated support team is there to follow up those reports and feedbacks. Also, you can recommend the game to your friends using Tell-A-Friend feature. You can also subscribe to our Notification Service to get updates of Protangle and information about newly released applications and games from us.

Protangle is designed and developed by the iPhone Team of Prolog Inc. We are determined to provide attractive games and applications in market.

What's New in Version 1.2

** Some bugs and errors are fixed
** New Advert system integrated to let user get less commercials

iPhone Screenshots

iPhone Screenshot 1
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Customer Reviews

Great idea

But it needs work, even for a free version.

1. Make the ads pop up before and after levels, not during.
2. Fix the sound, it turns on by itself after every ad.
3. The words "game paused" get stuck on the screen.
4. You can move all the spheres to the bottom and complete every level without trying.

Not working

Doesn't seem to work. Not enough contrast to tell for sure but when it looks like I've completed the puzzle it just freezes.

Ads are horrible.

I understand the ad at the bottom. I would also understand ads that would pop up after each level.

I don't understand why you would have random ads pop up in the middle of a game. For that, 1 star.

View in iTunes
  • Free
  • Category: Games
  • Updated:
  • Version: 1.2
  • Size: 2.8 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 2.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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