Puzzle Games

What is your favorite puzzle game??
I loved Myst Series, 7th Guest, The Witness, 11th Hour... spent so many hours on those and had my brain melted! hahaha!

Have you played Monument Valley yet? It's a very good game.

I heard but didnt tried yet! Ppl said good things about Monument Valley

Portal is by far my favourite puzzle game, such an amazing game by amazing developers, although the graphics are a bit dated now I suppose, I think it has a really great story and gameplay elements at the same time.