Which game should i redeem for myself in my inventory

All of the ones you're interested in.

A little bit of that and a little bit of that.

How the heck should we know what you like? Buying MW3 was just plain stupid :/

Awesomenauts! Also, EYE is pretty good.

Meat Boy,Issac,Sanctum,Civ 5,and Portal 2.

Killing floor is pretty cool to play with friends

Zeno Clash, Nexuiz, Super Meat Boy, The Binding of Isaac, Trine 2, Half Life 2, Magicka, Witcher, Awesomenauts, and Left 4 Dead 2.

EDIT: Killing Floor is damn good also.

EDIT2: Orcs Must Die is a must play.

Depends on what you like, but my recommendation would be one of these:

Orcs Must Die
E.Y.E. Divine Cybermancy
Company of Heroes
Civ 5

Batman AA & AC, Awesomenauts, Half Life 2, Amnesia, Civ 5, Portal 1 & 2, stop. :D

Batman AC and Street Fighter X Tekken, they are region locked ( Argentina ) :P

Bloodlines would be a worthy endeavor.

Awesomenauts and Noitu Love 2 are both very fun if you love platformer-type games.

nexuiz

Super meat boy,and then Batman arkham city. They're both amazing!!

Arkham City, Witcher 2, Super Meat Boy, Binding of Isaac, Trine 2,

The Binding of Isaac!

Amnesia

Super Meat Boy

Binding of Isaac

The Witcher 2

Vampire: The Masquerade - Bloodlines

Batman Arkham City

Brain stopd cant think....

Why do you have so many if you weren't planning on playing them? ._.
I'd say Amnesia, Super Meat Boy, Binding of Isaac, Tripwire/Killing Floor, Portal 2, L4D2, CoH Gold, Batman, and many others :)

Magicka if you have friends to play with, Binding of Isaac if you want to play something yourself. Also, you have two Night Sky keys so why not just use one anyways?