Battlefield 3 sold over 10 million units.

[rji]

also whats not to say that amnesia isnt a carbon copy of penumbra ? Yes the story and the time era are different, but the gameplay is identical. Solve puzzles, monster comes, either hide or haul ass, explore. Repeat x10

This isn't true. In black plague you ran between 1.2 and 1.5 times faster than the infected, meaning you could quite literally run circles around the monsters. Unless you are really good at holding drawers, you can't do that in Amnesia. You could say that Amnesia is an evolution of the game play seen in the Penumbra Series, but it is certainly not a carbon copy.