This game used to be about 7 times as long as the first portal when it was released, but now thanks to the steam community, it is practically infinite. If you are a fan of portal 1, this is a game which you unquestionably need to have. If you have to choose between portal 1 and 2, though, 2 is definitely a far better deal when considering the prices. If you are still debating on whether or not to get anything from the portal series, let it be known that it IS a very challenging puzzle game, but it is to this day the greatest puzzle game I have ever played, and probably one of the greatest games of all time.