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Cool idea!
You could use a Raspberry Pi to control a servo that then unlocks something like in this video:
You can program the RPi with a Linux console to only unlock when a challenge was solved.
For challenges, depending on the age of your kid, you could try to setup a few from https://overthewire.org/ on the RPi.
Awesome! Also, thanks for the link, I'm always looking for accessible hacking games. I had been using picoctf.org and tryhackme.com mainly, before this.
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