“Portal 2” does what the first game does so effectively, and then some. The game brings some new concepts that make the gameplay a little more complex as well as a longer story this time around. This is one of those older games that I would say will always be worth checking out because the design of every mission is so interesting. I don’t consider myself a puzzle game fan, but the “Portal” series is the exception to that rule. Overall, it is an inventive sequel with many challenging and enjoyable sequences.