Your nostalgic games - why?

Age of Empires was my nostalgic game, I still play it sometimes, the most recent one.

Age of Empires 3 and GTA San Andreas. God, I love both of them. Still play GTA SA every once in awhile.

All Valve products
Left for dead (2)
CS S
Team Fotress
And precious Half-life series

Has to be Garry's Mod, I couldn't believe how much I played that game until I think i had enough

the best Retro Games for me are the Lucas Arts Adventures like Monkey Island 1 and 2 and Day of the Tentacle.So many nice Memorys with these Games.

The best old games for me are the Lucas Arts Adventures like Monkey Island, Day of the Tentacle, The Full Throttle. So many nice memories with these games.

Buck stops with Runescape for me, old school servers got me back hooked on the game.

Dungeon Siege 2, Legend of Zelda, Pokemon Colosseum and Age of Empires. Those games are really nostalgic for me.

Hidden and Dangerous 2, played this so much at Lans with friends and the title music gets stuck in your head