I love causing trouble, and since she asked....
Atari 2600:
ET
Football
Boxing
Berzerk
Tank War
Hide and Seek
Star Gazer
Yars Revenge
Asteroid
Pac-Man
Table Tennis(even got the paddle joysticks)
Missile Command
Journey: Escape
Commodore 64:
The Last v8
Kik Start I and II
Cosmi Collection of 100 games(including The Forbidden Forest AND Beyond the Forbidden Forest)
Dig Dug
Rambo
Ikari Warriors
Captive
Finders Keepers
Ninja
NES:
Duck Hunt
Super Mario Bros (I, II, and III)
Gyromite
Popeye
Fester's Quest
Abadox
Adventures of Bayou Billy
Bad Dudes
Double Dragon(I and II, not III though)
The Legend of Zelda( I and II)
Battle for Olympus
Faxanadu
Silver Surfer
MLB
Tecmo Bowl
Metroid
Star Tropics
Final Fantasy
Goonies II
Mega Man (I, II, III that's it)
Golgo 13
Excitebike
Guardian Legend
The Ultimate Stuntman
Big Nose the Caveman
River City Ransom
POW
Ikari Warriors(I and II)
Contra(I and II(Called Super C)
Gradius( I and II(called Life Force)
Mike Tyson's PunchOut
Duck Tales
Magic Johson vs Larry Byrd
NES Play Action Football
Gauntlet(even have the four tap joystick port)
Dr. Mario
Tetris( I and II)
Karnov
Crystalis
(had to whip out Wiki to remember)
Arch Rivals
Base Wars
Batman
Bionic Commando
Blades of Steel
Castlevania(I, II, and my friend lost my copy of III)
Twin Cobra
Cybernoid(oh, my shame in admitting this turd)
Ghostbusters(I and II)
Jaws
Kung Fu
Renegade
Skate or Die
Spy Hunter
Teenage Mutant Ninja Turtles(I, II, and III)
Top Gun
Wizards and Warriors II
SNES:
F-Zero
Super Castlevania
Super Mario World(till my niece lost it)
Flashback
Out of this World
Shadowrun
Street Fighter II Turbo
Super Metroid
Pilotwings
Tecmo Super Bowl
NHL 1994
Killer Instinct
Secret of Mana
Secret of Evermore
Breath of Fire
Super Mario All Stars(redo of I, II, and III includes lost levels)
Lost Vikings
Ultraman
Sim City
Genesis:
Sonic 2
Shadowrun
Madden 94
Playstation(PSX):
Final Fantasy Tactics
I had a ton of bootleg games and a shadow ROM. But my *@ #$% sister-in-law stole them, and sold them for drugs(long story).
PC:
Scorched Earth
The entire Leisure Suit Larry series, including the text only game "softporn"
A ton of Hentai games including Sexy Beach 2
Command and Conquer
Command and Conquer: Red Alert
Sim City 2000
MechWarrior
Age of Empires
Stronghold
Overlord
...and whatever is free on Gametap at the moment
I retired from serious gaming in 1996, but maybe when I'm 50 and my mail-order bride from the Ukraine has left me for a used car salesman from Uzbekistan, then I'll get back into it.
But that's all the games I have, that I can remember off the top of my head.