Civilization (1/2/3 all sort of blend together for me), Sid Meier's Pirates!, Master of Orion, Master of Magic, Magic Carpet, Half-Life, Hexen, Team Fortress/Quake, Duke Nukem3D, Warcraft/Starcraft, Diablo, C&C, and so many others that remind of being at home on my Dad's then-cutting edge computer, before my Dad died, before I graduated school and had my own kids, before my parent's divorced, before everything got worse than it was, life was good just hanging out and playing games. The games may be "better" now, but I'd give anything to go back to the 90s/00s all over again.