WHICH IS THE OLDEST GAME YOU'RE STILL PLAYING TODAY :)

Mafia 2, actually good game. You should play it if you're bored and want an actual good game.

RaiderZ, Perfect World, Minecraft, Return to Castle Wolfenstein and Tibia.

Castlevania Symphony of the Night, hands down one of the best games ever created

This is definitely Heroes of Might and Magic. Game for the ages.

Mafia 1. I've always loved that game growing up, and I can't believe they're actually remastering it now Just hope it doesn't disappoint like Mafia 3 did.

Sonic the Hedgehog 2, Megaman 1-3, I enjoy most NES/SNES games still.

Maplestory... still going back to it like 15 years later

age of empires 2, with friends though. It's actually really fun when you get into it.

Starcraft II and Guild Wars 2, great games! I'll probably continue playing them for many years as well.

Final fantasy
I also still play pong and the original space invaders. Both of which I remember from my youth (yes I am that old)