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Spy themes are just cool. Code songs in MakeCode or CircuitPython so you can have one at the ready at all times!
Make a USB prank device using a Gemma M0 that will wiggle your victim's cursor every once and a while! Coded in MakeCode.
Ring in the New Year with a fun countdown clock that plays Auld Lang Syne! Doubles as a light-up party favor and noisemaker!
Use a Circuit Playground Express and stuff in your kitchen to build your own sound-activated snow globe.