From Steve Mould.

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This electrowetting device is called OpenDrop. You can use it to move water around for microfluidics applications. Or you can make games with it like Snake, Frogger, Crossy Road and packman.

Buy open drop here:
https://gaudishop.ch/index.php/product-category/opendrop/

Get the OpenDrop code here:
https://github.com/GaudiLabs/OpenDrop

You can buy my books here:
https://stevemould.com/books

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Buy nerdy maths things: http://mathsgear.co.uk