Puzzles, what are they good for?

[Googolplex]

Those are cleverly designed, but too hard for me (I don't want to exit the game every 10 minutes to check the answer). Penumbra puzzles are just perfect IMO

Silent Hill puzzles are also too hard for me, but I enjoy it.
I like hard puzzles, that challenge my brain.

Penumbra puzzles are good. But Amnesia is too easy in 80% of all puzzles.