These are the games that I have yet to beat. At least the number is coming down.

Wii
Bully: Scholarship Edition
Mad World
Super Mario Galaxy

Gamecube (Wii)
Resident Evil 2
Resident Evil 3

NES (Wii)
Castlevania 2: Simon's Curse
The Legend of Zelda II: The Adventure of Link

DS
Castlevania: Dawn of Sorrow
The Legend of Zelda: Phantom Hourglass
New Super Mario Brothers

PC
Arx Fatalis
Command & Conquer: Generals
Deus Ex: Invisible War
Dreamfall: The Longest Journey
Elder Scrolls IV: Oblivion
Fallout 2
Fallout 3
Indigo Prophecy
The Longest Journey
Mirror's Edge
Planescape Torment
Prince of Persia
Sam & Max Season 1
Greyhawk: The Temple of Elemental Evil

Xbox
Ninja Gaiden Black
Psychonauts

Xbox 360
Alone in the Dark
Assasin's Creed
Condemned 2
Dead Rising
Ghostbusters
Halo Wars
Lego Indiana Jones
Lost Planet
Ninja Gaiden II
Tomb Raider: Anniversary