It's contra and super mario for me , use to play when i was 15 -16 after that i stopped gaming completely.
Highest replay value I've ever gotten from a game is Sid Meier's Civilization 2, I still have it installed on my pc, first played it like 12 years ago. The second longest I've spent in any single game was everquest1, my account has been active about 10 years, but I'd say I played actively for about 6-7 of those. My main character has over a year worth of played time, meaning I invested like 10,000+ hours in game, lol.