Kung Fu was always one of the easiest games to me, even though it was a good one. only 5 stages about 1:30 each.
Contra is pretty damned easy, using the code of course, but since it wasnt a secret what-so-ever, then who even bothered with 3 lives?
1942 was one of those games you beat and it says "congratulations!" and thats it. Pretty easy arcade shooter.
Bad Dudes was pretty easy, it helped to know you could hold a to charge your punch. "I'm Bad!!!!"
Robocop (another Data East), I remember beating this game in the 2 days I rented it, and dont remeber anything even slowing me down.
I know I could beat all 5 of these games starting right now and ending in.........3 hours tops?