Games That Invented Genres?

[Leynos]

I wonder what the first create a game you can share online is? Likely something on PC or 90s consoles that escapes me. Oldest I can think of is Dreamstudio on SEGA Dreamcast. You make little levels then share them online. Mega Man Powered Up did that as well on PSP in 2006. Not talking about editing a track like Excitebike but an entire gamed based around the idea and share online. I know RPG maker was on PS1 but no online but I guess taking your memory card to a friends house?