Let them play colobot. It's very cool game (it has a rocket, alien spiders, and robots), and it lets you program your robots. Besides programming, they can also learn reading documentation.
If you have a shared library, you can dlopen() it (see man page), and receive symbol addresses by name (might be mangled). FORTH probably has a way to call C functions, search for "FFI". If you want to call stuff from asm, you might also want to search the web for "ELF", "ABI", and "calling convention".
Idk any arduino specifics.
I was more thinking of something like in zelda minish cap for example. The money pocket has a limited size, and if you collect more, you just loose it. There are also chests with money in the world that you can only open once. So you have to strategically evade chests with money, especially if the chest is easily reachable. And then there's also those damn shells.
If you like some music you heard in an anime, look up the artist and do some snowballing. That way you can easily find more music that you like.
If you want to find animes where the music is good, and not only find music to listen to, maybe (just some examples, definitely not complete):
Hunter x Hunter (2011): Awesome endings (ed 2 for example), as well as ost. (Old pre-2011 hxh adaptation also has good music afaik.)
Call of the Night: The op (or ed?) inspired the manga, and then in the adaptation they took the song. And the other op/ed music was then also made by creepy nuts.
Yamato: Op goes hard, and fits great to the space fights.
Terror in Tokyo: More sad than epic, ed/op and ost fit well.
Let them play colobot. It's very cool game (it has a rocket, alien spiders, and robots), and it lets you program your robots. Besides programming, they can also learn reading documentation.