I'll add more as I figure them out.

(SPOILER)
1A:
1B: Twisted Metal?
1C: Half-Life
1D: Halo
1E: Wii Sports
1F: Odin Sphere

2A: Left 4 Dead
2B:
2C: Saints Row
2D:
2E: Area 51
2F:

3A: Killer7?
3B:
3C:
3D: Angry Birds
3E:
3F: Chrono Cross

4A: Space Invaders, nice
4B:
4C: Assassin's Creed
4D: Golden Axe
4E: Dead Rising
4F: Star Ocean

5A: Megaman
5B: The Orange Box
5C: Little Big Planet
5D: Double Dragon
5E: Ultima Online
5F:

6A: Dance Dance Revolution
6B: Fallout
6C: Rainbow Six
6D: Silent Hill
6E: Neverwinter Nights, hahaha
6F: F-Zero

Edit: Ahh, caved and looked the rest up. They're all games I haven't heard of apart from 3B if Yearg got that right.