Puzzles, what are they good for?

[Googolplex]

The puzzles in Penumbra/Amnesia are logic?
Penumbra Requiem is completely unlogic, the mental realm & ending part of Black Plague also. Amnesia has too much "simple" puzzles that most of them are logic by default, but all the way is unlogic (watermonster, the shadow, flying Alexander etc.)

You should know that Horror games are between reality and psychological minds. In a mental world everything could be true. In Silent Hill you don't know what's real and what not. But the puzzles are almost logic, because someone could mount a code lock with hidden secrets in the environment or as a poem with corpses and numbers. This is not there because to break the flow, it's there because someone wanted to protect something and did not want you solving the mystery.

I never thought the puzzles were unlogic, in contrary. Most of them have todo with repairing an elevator, find a way in etc.

The piano puzzle is unlogic, that's right. But nevertheless one of the best puzzles in a video game. To hide secrets in a poem is always interesting.