Robotron 2084 (arcade)
Wonderboy in Monsterland (arcade)
Space Invaders (arcade)

GoldenEye by far.

Best single player = Half Life

Best multiplayer = CS for many years, now usurped by Desert Combat.

Star Control 2.

teenage mutant ninga turtles, it's that last game I beat without using cheats. Any of the Megaman series also.

STARCRAFT
Halo
Half life/ counter strike/TFC
Mario 64

GTA vice city
FFX and 7
Metal Gear Solid

Definitely Dark Cloud 2, Half life
And not sure if multiplayer counts, but
Natural Selection

Maybe final fantasy 3, or 7.

Myth 2: Soulblighter (I wish bungie would put the Servers back up)

Halo
Starcraft
Planescape: Torment
Fallout- 1 and 2

hmm too many to list. but those are among my faves.