Rating video games I've played/I'm playing: Limbo

I have just finished Limbo, a 2D puzzle-solving game from 2011 that I wanted to play for a long time ago.

The story is quite unclear, but my theory is that the main character is travelling through the "limbo" searching for his sister. You'll have to go through mortal obstacles, spooky enemies and intriguing puzzles in order to continue your journey.

The graphics are quite simple, and I think that's good for this game because it makes puzzle concentration more easier.

Personally, I give this game a 9/10 because it's very cool but at the same time very challenging for  my taste.