Why only Pc?

[naturon]

Because the XBox and Playstation are not built to play adventure games. Which is what Penumbra is at its core. You need a fluent mouse to play them as they were intended to. Can you really imagine playing say the Monkey Island games with a joystick? And despite having such prominent adventure elements, Penumbra presents itself as a survival horror game. To make up for a lack of offensive capabilities (especially in Black Plague), the controls are centered primarily around mobility and maneuverability.

Personally, I always found moving especially in first person shooters on the XBox and Playstation to be awkward. I'm sure there are some people that have mastered those controls but honestly, it's a fact that movement on the PC is a lot easier and more fluent than on the consoles. I'm not going to say my inability to control means no one is able to, but it still strikes me as very counterintuitive and simply inferior.