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By Bithack

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


Welcome to the world of Principia.
Solve puzzles using the laws of physics. Help the robot get to the goal by building contraptions, bridges and vehicles.

Open up the sandbox editor and use over 190 unique objects to create anything from a simple teeter totter to a working calculator. Use the advanced electronics system to create your own games. Upload your creations to the community website or download creations by others.
Join thousands of other players and compete in the weekly Building Contests!

Play freely in the Adventure mode, explore worlds and progress by gathering resources and constructing objects that can be used to build anything you can imagine.

What's New in Version

Fixed a few critical graphics glitches occurring on newer iOS devices (iPhone 5S, iPad Air), and some crashes related to dialogs.
Improved opening/closing of community view.
Added more links to help resources.


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iPad Screenshot 1
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Customer Reviews


Hey guys I love this game it's awesome! There are a few bugs though, it would be really great if some updates were released considering this is a paid app.

Here is my experience playing on the iPhone 5s.

1. The game does not save progress in Main Puzzle mode, on quitting the app and opening latter my progress has disappeared and I'm forced to start from the beginning levels. This is really frustrating!

2. It is not possible to play any community levels any time I try to play or edit one I get "an unknown error has occurred".

Thanks for an awesome app guys first Apparatus now this :) But please get some updates / fixes happening.


View in iTunes
This app is designed for both iPhone and iPad
  • $5.99
  • Category: Games
  • Updated:
  • Version:
  • Size: 20.4 MB
  • Language: English
  • Seller:
Rated 12+ for the following:
  • Infrequent/Mild Simulated Gambling
  • Frequent/Intense Cartoon or Fantasy Violence

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad and iPod touch.

Customer Ratings

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