Gamer Dad writes:
"The game is obviously longer than the original, but is still a bit short in comparison to some games. However, since each test is more of a puzzle than a standard FPS level, gamers can go back and retry each level to earn badges or rewards for completing them with minimal resources or time. In addition to the main story mode, there is also a two player mode with a series of challenges that can only be attempted by two cooperating human players. All in all, Portal 2 is well worth a rental at a minimum if not an outright purchase for most gamers willing to give it a try."