Gaming generations

I've said before that I'm a gamer, but it's kinda strange that I got my first PS2 when I was 15. I never played the NES or SNES, or the PSOne or Nintentdo 64. I played a bit of Sonic on the Sega Genesis (don't know why I say Genesis instead of Sega Mega Drive, but there you go) but there are a lot of games I missed out on. So even though I consider myself a gamer, there is a lot of stuff that I just haven't played, because I jumped straight to PS2. I really feel now that I need to hunt down these classics; my PS2 is backwards compatible, the entire PSOne library is open to me. I actually bought a Sonic Collection for a tenner in Game, and feel I should try to hunt down a lot of these.