First SEGA game I ever saw was this, I was in the USA back then, 1992 I think.
Game was displayed on a TV, and below in display, you could see the cartridge with the giant Robotnik crushing the 2. 7 years old me was amazed.
Back in France, I lost track of the Genesis, but got a Master System. I was the happiest kid in the world. It had Sonic built in.
Some time later, I witnessed this beauty running Sonic the Hedgehog 1, in the house of a friend of my older sister. I was blown away.
Most beautiful console ever. I actually found Green Hill Zone prettier than Emerald Hill Zone.
But still, it wasn't the day for me to get a Mega Drive. This day only arrived when this pack released late 1994 :
And honestly, Sonic & Knuckles managed to blew my expectations even more. I found the game much better and much more impressive than the first two games.
Ever since, I loved the Mega Drive and played a ton of fantastic games on it.