10 is really, really tough for me, but I could probably narrow it down a bit like this (and this still feels way too short):
Arcades / ZX Spectrum days
Elite
Centipede
Pacman
Battle Zone
Defender
Asteroids
Colossal Adventure
Jet Set Willy
Manic Mansion
Lords of Midnight
Knight Lore
Alien
The Hobbit
Ye Older PC Days
Doom 1 & 2
Elite 2
Star Wars X - Wing
Tie Fighter
Ultima Underworld 2
Syndicate
Myst
Day of the Tentacle
Curse of Monkey Island
Beneath a Steel Sky
Half Life
Quake 1 & 2
Bioforge
System Shock
Myst
More Recently
Half Life 2
Counter Strike
System Shock 2
Deus Ex
Thief 1 & 2
Ico
Silent Hill 1 & 2
The Longest Journey
Uru
Halo CE
SOTC
Vampire Bloodlines - Masquerade
Most Recently
Uncharted
STALKER
Fallout 3
Little Big Planet
Portal
Flower
Cthulhu - Dark corners of the Earth (spelling! too lazy to check)
Gears of War
Mass Effect
L4D
Try to be reasonable... its easier than you think...
