DIY Electronic puzzle box

Schematics and information :
http://majsterkowo.pl/zagadkowe-pudelko-na-prezent/
Music used: Notion of the Past by Jens Kiilstofte https://machinimasound.com/music/notion-of-the-past/
Licensed under Attribution-NonCommercial-NoDerivatives 4.0 International (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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Joe McPhail says:

what?

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