I just played/beat Portal 1 last week, and to be frank I was quite disappointed. I beat it in about 2.5 hours. I literally thought I was beating the intro-/training to the game, and then the credits started. The concept was cool and puzzles were okay but way too easy, which is why the whole time I was waiting for the REAL game to start (not the training mode that I thought I was in). Unless someone can convince me Portal 2 is much much better and more difficult as a puzzle game, I'm not very interested.