I had hankering today to play Sonic the Hedgehog 2. Usually a big reason for this is just for the music and today was no exception. Sonic 2 has some of my favourite game music let alone music from the Genesis (or Mega Drive everywhere outside of North America). Despite the Genesis having less clever audio processing than its mortal enemy the Super Nintendo.
Behold, a few reasons why the Genesis Mark 1 had a headphone jack.
Emerald Hill Zone
Chemical Plant Zone
Mystic Cave Zone
Oil Ocean Zone