Arcade:
Asteroids (this one got me hooked...)
Battlezone
Bezerk (this one cost me more quarters than any other game...)
Centipede
Defender (simply awesome game! I even have it now on a GBA cartridge)
Pacman
Phoenix
Space Invaders
Star Wars ("cockpit" arcade unit... too kewl)
Tempest
...I forget.
Nintendo DS & GBA
Mario Kart DS
New Super Mario Bros.
Metroid Prime: Hunters
Space Invaders Extreme
Metroid Fusion
Duke Nukem Advance
Doom
Doom II
Sony PSP
Wipeout Pure
Burnout Legends
Metal Gear Solid: Portable Ops
SOCOM: U.S. Navy SEALs Fireteam Bravo
SOCOM: U.S. Navy SEALs Fireteam Bravo 2
Syphon Filter: Dark Mirror
Syphon Filter: Logan's Shadow
PC:
Batman Arkham Asylum
Call of Duty: Modern Warfare (aka COD 4)
Call of Duty: Modern Warefare 2
Call of duty: Black Ops
Crysis
Crysis: Warhead
Dead Space
Doom (this one changed the face of Gaming)
Fallout 3
Far Cry
F.E.A.R.
Forsaken
GTA III
Half-Life (this one changed the face of Gaming... again)
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two (Orange Box)
Halo: Combat Evolved (this one changed the face of Gaming... again)
Max Payne
Max Payne 2 - The fall of Max Payne
No One Lives Forever 2
Quake III Arena (cult game)
Return to Castle Wolfenstein
Star Wars: Jedi Knight - Dark Forces II (cult game)
System Shock 2 (cult game)
Tom Clancy's Ghost Recon
Tom Clancy's Ghost Recon: Advanced Warfighter
Tom Clancy's Splinter Cell (this one changed the face of Gaming... again)
Wing Commander V - Prophecy (cult game)
PC, part 2:
Aliens vs. Predator
Armed & Dangerous
Assassin's Creed
Bioshock
Call of Duty (this one changed the face of Gaming... again)
Call of Duty 2
Call of Duty: United Offensive
Dead Space
Deus Ex (cult game)
Doom II
Doom 3
F.E.A.R.: Extraction Point
Freedom Fighters
Freelancer
Gears of War
Giants: Citizen Kabuto
HomeWorld
Kingpin
Manhunt (cult game)
Medal of Honor: Allied Assult (this one changed the face of Gaming... again)
Medal of Honor: Allied Assult - Breakthrough
Medal of Honor: Allied Assult - Spearhead
Messiah
No One Lives Forever
Operation Flashpoint
Quake II
Serious Sam (cult game)
Serious Sam: The Second Encounter
Shogo
Stalker: Oblivion Lost
Star Wars: Jedi Knight - Mysteries of the Sith
Star Wars: Jedi Knight II - Jedi Outcast
Tom Clancy's Ghost Recon: Advanced Warfighter II
Tom Clancy's Ghost Recon: Desert Siege
Tom Clancy's Ghost Recon: Island Thunder
Tom Clancy's Rainbow Six: Vegas
Tom Clancy's Rainbow Six: Vegas 2
Tom Clancy's Splinter Cell - Chaos Theory
Tron 2.0
Unreal (this one changed the face of Gaming... again)
Unreal 2
Unreal Tournament (this one changed the face of MP Gaming)
Unreal Tournament 2004 (cult game)
Vietcong
XIII
And YES, these are only the "memorable" ones; I have over 200 games and I actually paid for all of them *gasp*.
Unfortunately, there's a few I paid for that I really wish I hadn't... Here's some from the PC platform, for example:
Blood II - Nightmare Levels
Chrome
Daikatana (biggest letdown in the entire history of PC gaming...)
Gunman Chronicles
Iron Storm
Nocturne
Outlaws
Pariah
Resident Evil 2
SiN - Wages of SiN
Soldier of Fortune - Payback
Yager
...I forget.
After-school skateboard runs to the local arcade for a few hrs of Bezerk & Defender followed by a big slice of extra-cheese peperoni pizza and a coke... man, those were the care-free days... :beer: