Interesting. Pure. Exiting. Metaphysical. All in all, the best platform/shooter I've ever seen. Kudos, for a mark on my soul left from the story, the only good one in 6 years.
This game doesn't test your IQ level, it tests your pattern-finding skills. It's like saying Fold-It tells you how much chemistry you know, or geology tests tell you whether or not you'd get lost in a European neighborhood.
Great game, but it's easier than learning about nuclear physics, and you NEED to turn down the virtual contrast, everything's leaving blurs everywhere. 4/5