This game is really really great. Not only is it a fun side-scrolling puzzle game, it's the best looking game I've ever seen, and it's all rendered in dark grays. The view zooms in and out depending on where you are, and the world goes out of focus on the edges of the screen, which, along with the blurred background (and foreground) creates a nice feeling of walking through a 3D world. Plus, it's done in all dark grays, with a constant subtle flicker and grain that gives it the appearance of old B&W film.

The solutions to most of the puzzles are hard enough to be challenging, and many of them are hilarious - in a grim and absurd way - but a few were really subtle, and I had to peek at a walkthrough a couple of times. Still, it's not as difficult as the very similar 2D side-scrolling puzzler, Braid, which was kind of over-the-top hard, at times. This was just right.

It's quick, too. I got through it in a few afternoons.