Sega Genesis X-Band Commercial (Online Gaming) - YouTube

I was talking in some nostalgia of Old School Games, with my friend then he said to me about the old 16 bit consoles. SNES/Genesis. He also mentioned that they had online play. So I decided to look something up on the topic and I found this. A Peripheral to play games online Via 56k Modem Add on to the Console. I thought I'd share it with the masses.

I wonder how it works. I wish the dreamcast had A cartridge slot like the Saturn/Genesis