20 klangsquares challenge your ears. Which bird is singing? Which composer is playing? Can you fit proverbs together? Recognize foreign languages? Place your smartphone with the klang² app open in the middle, place a klangsquare on the Nfc reader and prick up your ears: Let's get started with your acoustic game collection!


Aha! klangsquare!

With a combination of analog (klangsquares) and digital (your smartphone) you will experience a new game genre with endless possibilities.

Today, every klang2 set already contains 11 games. Let yourself be surprised by new games, they appear automatically in the app!


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  • NM

    I think the idea is brilliant and the product is an aesthetic hit. Bravo!

  • GR

    A crazy idea and a really fantastic game!!! I couldn't stop being amazed...! Hats off!!!

  • IW

    We can hardly believe what beauty is in these squares.

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Not just another mobile game...

...but an invention with a vision. Imagine a games collection with hundreds of games from all over the world. That's what we are working on.

klang² kaufen

Who we are

Sebastian Oberlin

Sebastian Oberlin, born in 1980 in San Francisco, CA, learned to play the violin at the age of 4. After training as a violin maker in Milan, he runs his own studio in Freiburg, Germany. His path crossed with Adrian on a walk in the forest in 2017...

Adrian Rennertz

Adrian Rennertz is a media artist, musician and programmer from Ulm.
After studying media informatics in Cologne, he first worked  in Berlin before moving to Freiburg where he turned his favorite project klang² into his main job.

  • Ellie Lutz

    Online shop management + customer support + photography

  • Polina Oberlin

    Communication + social media

  • Eli Watts

    Production + Quality Control