While they're basically dead, they had a very long history just like Nintendo so I felt a companion thread was needed, Sony probably could use one too at this rate.

Sega lasted a long time as Service Games and eventually went from video games into home systems. You've got your SMS, Genesis (32X and Sega CD addons), Saturn, Dreamcast, Gamegear, Pico and more, so what's your favorite game on the systems you've owned or used?

There were a few systems that only hit Japan or down in South America if you've used or own them have at it.