Bangai-O Spirits' level designer had a neat feature. You create the level, and you can export it to an audio file that you can reload by playing the audio file back when in receive mode.
I mean, surely it was purely for aesthetics but... dang it was really cool.
@Nine God that was really cool, huh
I remember vaguely hearing of online communities that stored levels via audio files you could download and like. God. That's so cool