I highly recommend it. It is a game that do something that very few games do: it trust that you are an intelligent person, and does not hold you hand. The game never uses verbal or written communication to explain to you what the goals and the rules are, you must figure it by yourself. Like a scientist, you must infer what are the meaning of things, forming your hypothesis and testing them. I challenged myself to finish the game without any help, and after 56 hours, I did it. It is a very rewarding experience and I recommend it to everyone.
But what I would like to discuss is not the game itself. It is one of the topics that was presented in a very subtle way, and made me think for a while... There is an Audio Log with a citation of Douglas Hofstadter, which discuss the perception of what is "more real", and how that changes drastically depending on who is 'experiencing' reality:
The Witness : Citation - Douglas Hofstadter
Then, in another moment in the game, I've found a lecture of Richard Feynman in which he describes the 'levels' of fundamental laws of nature. Feynman brilliantly points out that our experiences are often very far from the scientific perspective of things. The concept of heat is related to how fast the atoms are jiggling, but when you are hugging someone you love and feel the warmth of his/her body, this concept seems very distant.
The Witness: Richard Feynman
So, could this be the reason of why so few people are into science? Very often the scientific truths are "many levels" away from our perceived reality... Could it be that a lack of interest on abstract ideas in favor of more practical and tangible aspects of reality is a part of the evolutionary process of our intelligence? Could it be that the aversion to deep abstract thinking on the majority of the human species is due to the fact that our brains are still strongly attached to our animal origins, which only cares about the 'here and now'? What do you guys think?
The Witness: Discussion on Atheism