A) Alpha ProtocolPrince of Ales said:stole the formatting from you, thanks!
B) Battlefront II
C) Civilization V
D) Dragon age: Origins
E) Empire Earth
F) Final Fantasy VII (this one was tough, fallout new vegas and fable were both in the running as well)
G) Gears of war
H) Halo 2
I) Icewind Dale II
J) Jade empire
K) Kingdom hearts 3 (I know it's not out, but dammit I want it, kerbal space program almost took this spot.)
L) Left 4 dead 2
M) Mass effect 1
N) Neverwinter Nights 2 (preferred the second game greatly over the first)
O) Ocarina of time
P) Pillars of eternity (really excited to play this)
Q) Quake
R) Republic commando (star wars)
S) Star wars: KOTOR II (had to sneak kingdom hearts in there, so used star wars here)
T) The force unleashed
U) Uncharted 2
V) Vampire: The Masquerade: Bloodlines
W) Witcher 3 (the second one was amazing, and the third one looks fucking awesome as well.)
X) X-com enemy unknown/within (within is the expansion version basically.)
Y) Yellow (pokemon)
Z) Zone of the enders: HD collection
Reserving the right to edit the shit out of this post.
honestly that was tough..there are a few letters that have WAY TOO MANY of my favorite games, while some I barely could scrounge up a game title at all.