JJ1 for me starts becoming picky when windows 98 and faster computers become involved, so I can't play it. Even so, there are little tidbits in jj1 that I miss.

-the "Hit" shields

-the fast feet mode

-bonus stages

-the complete randomness of the bouncers

-jj1's overworked readme (Complete with weapon, enemy, and world descriptions)

-the final awe-inspiring boss!

What I DON'T miss, mind you, is most of the music. episodes 3-5 have some rather dull music that dampens the experience and makes the levels seem more like a chore,Sluggion being the worst in my expirience.