Your Favorite Video Game Sequel...

Mine is Super Mario Bros 2 from Japan (aka The Lost Levels here in the states)
What about you guys?

Mercenaries 2 isn't out yet so for now it's Half-Life 2

 Yeah that one is definitely on my top ten, but not my favorite.

I'm probably going to go with God of War 2.  It took everything that made the first one awesome and doubled it.

Id go with Halo or Warcraft.

Donkey Kong Country 2

You'd probably think not being able to actually play as Donkey Kong would be a bad thing but this game perfected everything the first one established.

Prolly majora's mask

I would have to go with GTA IV

Jak II mainly because it had such a different feel and style then the first game.