Monument Valley is an elegant puzzle game where you guide a young princess, Ida, through a maze of ruined monuments. You manipulate the landscape to let Ida get from place to place, using optical illusions to your advantage – as in Monument Valley, when walkways appear to line up, Ida can walk along them – even when you know that they really don't.

It was created by London-based Ustwo Games - an offshoot of digital agency Ustwo - and proved to be incredibly popular, selling over 26 million copies. It also made a guest appearance in the hit Netflix show House of Cards (below). We visited Ustwo Games' offices on find out about its creation from executive producer Dan Gray, designer and artist Ken Wong, director of games Neil McFarland and technical director Peter Pashley.

In these films they explain how the works of MC Escher and the architecture of ancient temples inspired both Ken's visuals and way the game is played.

The team also detail how they designed a game that's not aimed just at 'game players' and how they refined its design through extensive testing with real users.

The team also revealed their favourite things about the game and its creation in the video below.

Monument Valley is available from the Apple App Store or the Google Play Store for £2.99.

Interviewer // Neil Bennett
Video producer // Dominik Tomaszewski
Editor // Neil Bennett
Assistant // Grace Rasmus