Limbo is a great puzzle and platform game for multiple platforms. It has recently been released for Mac OS X, but it is also available for the Xbox 360, Playstation 3 and PC. You can buy the game on Steam or the Mac App Store. I am delighted to say that Limbo runs great on the Mac and it is every bit as good as any of the other platform versions.
The first thing you will notice about Limbo is that it is very dark. The levels are all designed in black and white, which helps to set the atmosphere designed by the creators. The game feels like a bad dream. You control a little boy who has to walk through forests and escape from several different types of life forms, including giant spiders and aliens. Not much is said about the story until you play the game for yourself. I will not spoil it for you, though.
There are many different gameplay elements in the game. There are different puzzles in which you have to grab objects and re-arrange them to make your way through a level, and there are also physics-based puzzles more at the end of the game.
Limbo is best played with high volume and in a dark room. I haven't seen such a frightening game in a long time.
In short, Limbo is a great game that has a very dark mood and lots of puzzles. It is an instant classic.