Gah! My list-OCD D: What have you done! Stahp!
So uh... Do ports of the same game count? How about small downloadable PC games? Also how much do you have to do in a fighter to count as "completed"?
NES:
-Wizards and Warriors
-Double Dragon II
-Castlevania
SNES:
-The Chaos Engine
-Clock Tower
GBC:
-Resident Evil Gaiden
-Castlevania Adventure
GBA:
-Legacy of Goku
-Legacy of Goku II
-Castlevania: Harmony of Dissonance
-Castlevania: Aria of Sorrow
-Yoshi's Island
-Double Dragon Advance
NDS:
-Phoenix Wright: Ace Attorney
-Phoenix Wright: Justice for All
-Resident Evil Deadly Silence
-Grand Theft Auto: Chinatown Wars
-Legend of Kage 2
-Shantae: Risky's Revenge
3DS:
-Resident Evil Revelations
-Mighty Switch Force
PS1:
-Resident Evil: Director's Cut
-Resident Evil Survivor
-Resident Evil 3: Nemesis
-Vigilante 8
-Heart of Darkness
-Destruction Derby Raw
-Disney's Donald Duck Quack Attack
-Pocket Fighter
-Destrega
-Italian Job
-Hot Wheels Turbo Racing
-Jurassic Park Warpath
-Strikers 1945 II
-Dukes of Hazzard: Racing For Home
-Tony Hawk's Skateboarding
-Digimon Rumble Arena
-Crash Bandicoot 2: Cortex Strikes Back
-Crash Bandicoot 3: Warped
-Crash Team Racing
-Guilty Gear
-Street Fighter Alpha
-Carmageddon
PS2:
-Resident Evil 4
-Resident Evil: Dead Aim
-Mortal Kombat: Shaolin Monks
-Mortal Kombat Deception
-Mortal Kombat Armageddon
-Silent Hill: Shattered Memories
-Viewtiful Joe
-NeoGeo Battle Coliseum
-Grand Theft Auto III
-Grand Theft Auto Vice City
-Metal Slug
-Metal Slug 2
-Metal Slug X
-Metal Slug 3
-Metal Slug 4
-Metal Slug 6
-Digimon Rumble Arena 2
-Max Payne 2
-Driv3r
-Crash Bandicoot: The Wrath of Cortex
-Jak and Daxter: The Precursor Legacy
-FlatOut 2
-Tony Hawk's Pro Skater 4
-Tony Hawk's Underground
-Tony Hawk's Underground 2
-Family Guy Video Game
-Smash TV (Midway Arcade Treasures)
-Toobin' (Midway Arcade Treasures)
-Vindicators (Midway Arcade Treasures)
PS3:
-Resident Evil 4 HD
-Resident Evil 5
-Resident Evil 6
-Resident Evil: Operation Raccoon City
-Killzone 2
-Killzone 3
-Mortal Kombat
-Silent Hill Homecoming
-Army of Two
-Army of Two: 40th Day
-Uncharted
-Uncharted 2
-Duke Nukem Forever
-King of Fighters XII
-Marvel vs Capcom 3
-Ultimate Marvel vs Capcom 3
-Street Fighter 4
-Street Fighter x Tekken
-Lollipop Chainsaw
-Max Payne 3
-Dead Rising 2
-Motorstorm Apocalypse
-Ninja Gaiden Sigma
-Ninja Gaiden Sigma 2
-BlazBlue: Calamity Trigger
-Heavy Rain
-Castlevania: Lords of Shadow
-Grand Theft Auto IV
-Grand Theft Auto IV: The Lost and Damned
-Super Stardust HD
-Prehistoric Isle
-Vanquish
-Jetpack Joyride
-Double Dragon Neon
-Renegade Ops
-Dead Nation
-1942: Joint Strike
PSP:
-Corpse Party Blood Covered Repeated Fear
Amiga 500:
-Smash TV
-Lotus Turbo Challenge 2
Dreamcast:
-Power Stone
-Expendable: Millenium Soldier
DOS:
-Cosmo's Cosmic Adventure
-Secret Agent
PC:
-Doom
-Resident Evil 2
-Alan wake
-Alan Wake's American Nightmare
-Peggle Deluxe
-Soldier of Fortune
-Counter Strike Condition Zero
-Portal
-1213
-The Trials of Odysseus Kent
-5 Days a Stranger
-7 Days a Skeptic
-Trilby's Notes
-6 Days a Sacrifice
-Trilby: The Art of Theft
-Cave Story
-Down by the Laituri
-Ignition
-Karoshi 1.1
-Karoshi 2.0
-Karoshi Factory
-Metal Slug 5
-Minty Fresh Adventure!
-Momentum Missile Mayhem
-Pleasure Island RPG
-SCP-087
-SCP-087-B
-Luna, Luna 2, Luna 3, Luna 4, Luna 5, Luna 0, Luna END
-Little Fighter 2 (+7 full game mods)
-Corpse Party -Rebuilt-
Neo Geo X:
-Cyber Lip
-Magician Lord
Mobile:
-Simpsons Arcade
-Darkest Fear
-Darkest Fear II
-Darkest Fear III
-Doom RPG
-Doom II RPG
-Wolfenstein RPG
-Silent Hill Orphan
-Silent Hill Orphan II
-Silent Hill Orphan III
-Resident Evil Missions
-Resident Evil Confidential Report
-Abracadaball
-Grand Rally Championship
-Hardy Dave
-Worms 2008
-Asteroids (getting over stage 100 should count, right?)
So uh... that makes
171 finished games, plus those 7 full game mods of LF2 and one mobile game whose name eludes me. I suggest you check at least my PC games section and tell me if there's something wrong with it.