Venture, Spiderman(2600), River Raid, Pitfall 2, California Games(the 2600 version rules, seriously, if only for the BMX!), Adventure(the first RPG EVA!), Air Sea Battle, Choplifter, Donkey Kong, Donkey Kong Jr., Food Fight, Home Run, Moon Patrol, Mousetrap. Out of all of those, my top picks are Venture, Spiderman, California Games, Air Sea Battle, Food Fight, & Moon Patrol.
Venture-Big ol smiley face running around with an arrow sticking out of his ear, great game, call it Smiley Joe's Adventure's in the Congo of Death!
Spiderman-does whatever a spider can, crawls up walls, stick with webs, call it Whiplashman, or the Adventures of Hooklad!
California Games-do I need to introduce this one? Seriously though, based on the 2600 version, I love playing the BMX over & over, call it Florida Olympics or Surf Bike Hackysack Skate or Perish!
Air Sea Battle-multi player fun for hours, call it Heir See War or Oxygen Yes Conflict ot Error Z Fight!
Food Fight-needs no intro, call it Lunch Punch or Dinner Flinger, or Breakfast Bar Fight!
Moon Patrol-is legendary, call it Saturn Scout or Crater Crawl or Jupiter Stroll,