I remember this. It was good fun, and it's been just long enough that these are difficult again.

(SPOILER)
A-1: Endless Ocean
A-2: Left 4 Dead
A-3:
A-4: Space Invaders
A-5: Megaman
A-6: Dance Dance Revolution
B-1: Twisted Metal
B-2:
B-3:
B-4: Elite Beat Agents
B-5: The Orange Box
B-6: Fallout
C-1: Half-Life
C-2: Saints Row
C-3: Disgaea: Afternoon of Darkness (I remember that from last time )
C-4: Assassin's Creed
C-5: Little Big Planet
C-6:
D-1: Halo
D-2: Lost in Blue
D-3: Angry Birds
D-4: Golden Axe
D-5: Double Dragon
D-6: Silent Hill
E-1: Wii Sports?
E-2:
E-3: Qbert
E-4: Dead Rising
E-5: Ultima Online
E-6: Neverwinter Nights
F-1: Odin Sphere
F-2: Altered Beast
F-3: Chrono Cross
F-4: Star Ocean
F-5:
F-6: F-Zero?