Portal 2

Yet another game announced at the E3. Portal is a very interesting puzzle game, worthy of any lover of puzzle games. In Portal 2, the computer from the original Portal somehow reboots itself and more or less begins to rebuild itself. You use some kind of gun that can create a portal and will send you into a different part of the level. Simple gameplay, yet hard, if not aggravating puzzles. It will be released in 2011.