If you could live in any video game world...

Lordran. The land of the undead. Dark souls. stuff.

Deus Ex: Human Revolution or SR3 or GTA san andreas ... omg that would be epic :D

middle earth !!!!

Playboy the mansion?

Hyrule

Silent Hill :D

Since you said "could" not "have to". I wouldn't at all. No game comes even close to the wonders of this world.

Hmmmmmm... it'd be an RPG of some sort, probably an MMO. Respawn when something goes wrong and you don't have to be the chosen/legendary one to become super awesome from training. You'd more likely to have a respec option, even if it is expensive. But which game... hmmmmmm...

F*ck Quest.

Or F*ck Quest 2.

Don't judge me.

infinite Portal chambers xD

Fallen Earth for sure. Postapocaliptic!

Ragnarok Online

Sword Art Online! ;D

Peggle Deluxe. Nice scenic place where all they do all day is play with their balls.

of cause just cause

This one, earth. Why? Because there are many games based on earth. Half Life, Mechwarrior: Online... After all, who wouldnt want to meet Freeman, or stomp around in a giant robot?

Mount and Blade (Warband) - Praven.

fallout new vegas

Demon's souls, cause dark souls its too hard for me...
Imagine killing demons and getting s tronger with every kill, if you die its not the end, you still can restore your human flesh if you are good enough at slicing demons... otherwise you will be a stray soul until you go crazy, but still worth it!

For me, I would actually be in Minecraft. Peaceful mode, though, but it would be the most epic and good looking place ever

The Far Cry 3 island so i can get some cool tats!
That is, if i'm awesome enough to get into the Rakyat.

Deus Ex, Final Fantasy X or VIII.

Mass Effect (Dem aliens!) or Deus Ex. Middle ages- no thanks.

Lula - The wet empire ;)

Dark Souls, Lordan. That'd be epic.