Should I buy Penumbra?

[Googolplex]

Penumbra is better than Amnesia, but most people will jsut recognize that when playing Penumbra first. Because this is why they look at every single detail Amnesia doesn't have.

The first Penumbra (Overture) is the best in my opinion. It's not scary like the second (Black Plague) but it is by far the better experience. More tricky physic puzzles, better part of story etc.

But you should definitely buy the Collection with all three Penumbras.
But be sure to play it in correct order:

1. Overture
2. Black Plague
3. Requiem

Don't pick up just the scariest. All three are scary and have only ONE story.