OK, I'll go all-in on this:
2000 AD Comics' Nexus, The computer game.
Made for the Commodore C128 computer (which oddly ran Microsoft Basic), it was a simple single-screen platform shooter with the twist that you could pile up the bodies of your enemies and use them as platforms.
When was that? Last time I tried it was a couple of years ago.
As for the difference, outside of Spain the conjugation of Vosotros (you, plural) isn't used, but speaking to strangers is much more formal. Also, there's a lot of vocabulary differences which can be confusing for non-native speakers.
Good luck with your learning, it's a great language :-)