I played the original Sonic on one of my cousin's systems. I later got my own Genesis complete with Sonic 2. I originally had to use a cheat code to beat it (allows you to edit the map so I could add an infinite number of rings and become invincible while fighting Robotnik. Later, I developed skill enough to beat him without the tricks. I played a lot of Sonic & Knuckles (Knuckles quickly became my favorite character partially because I hate how Sonic has been characterized as a snarky arrogant punk ever since). I still own Sonic Spinball, the only other Sonic game that I've beaten (and imo the best iteration of an adventure-themed pinball game... well best iteration of a pinball game ever because I hate pinball). I have played no other Sonic games since.