Where did all the puzzles go?

I'm looking for a really good, free online puzzle game. I'm not talking crosswords, sudoku or anything like that, I mean games that have a story, need puzzles to be solved to progress and they aren't simple point n clicks. I want to really have to use my brain, have to search out information online to solve things I wouldn't be able to alone and something that will rack my brains.



I'm not looking for an ARG as I play those already, I'm looking for something a little less group oriented. If anyone has any suggestions, please let me know, but no stupid answers or links please.Where did all the puzzles go?
I really like Portal: Flash Version.



You may have heard of Portal, it's a really cool puzzle game. Unfortunately, it costs something around twenty dollars, like any PC game. So the online flash version was created. It's not nearly as fun but it captures the essence of getting to an exit using portals.



Also Visit 2, although you need to install a plugin. If it's a free download, then Visit 2 is fun as well.



Deconstruction on AddictingGames is tricky too.