What are some good puzzle games for the xbox 360?

s r: What are some good puzzle games for the xbox 360?
Not so much puzzle, but games that require you to think?
Alone in the Dark did icorporated this well (Its great if you havent played it), i was considering Alan Wake but ive heard so many mixed reviews on it im not sure. What about arcade games, im not usually willing to spend microsoft points unless i know the game will last more than ten minutes. Any indie games that do this well aswell, im a big fan of indie games!

Answers and Views:

Answer by Kenny
Look up a game called Braid. It’s a side scroller that allows you to manipulate time and presents both simplistic and very challenging puzzles to solve using the manipulation. Another game that is similar to this effect is The Misadventures of PB Winterbottom. They may seem kiddish at first glance, but they do present some pretty tough challenges.

Answer by phaydeout
Portal is awsome, and I really like Braid.

Answer by shonei
Portal.Plus Portal 2 is coming out soon.Good game.