After a spell of exclusivity on Android, impossible contraption game Principia has built itself a home on the App Store.

At it's core, Principia is about using your noggin to create weird and wonderful structures. Sometimes, these structures will let you direct a small robot from one side of the screen to the other.

However, with a little bit of graft and a basic understanding of mechanical engineering, you'll be able to knock up a fully functioning tank, complete with meaty tracks and working cannon.

As you can see from the trailer below, your creations are limited only by your imagination. If you fancy testing those limits, you can download Principia for £2.49 / $3.99 from the App Store right now.

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