You'll need that so you can spend excess credits on upgrades for your stuff. The schematic for Power Nodes is in there. At the first power-node-locked room (this is at the start of Chapter 2), be sure to open it up. (Thanks to Robotic Aquatic for this tip). Consider kicking up the Brightness setting a couple of notches to take the edge off some of the darker sections of the game.

Otherwise, try to make do with the PC and get the FG schematic from the locker in Chapter 7 right after you get off the Tripod elevator. If you don't have the Collector's Edition Force Gun or a DLC Force Gun, I would seriously contemplate downloading a force gun to make your life easier as you don't get the Force Gun until pretty late in the game.

Here is a general overview of how to get this and retain your sanity: *WARNING* SPOILERS HEREIN *WARNING* *I talk about particular sections of the game in this guide in order to talk about how to survive them! If you haven't seen this whole game through to the end, please finish a playthrough on a lower difficulty before even considering Hardcore.* AT THE START: - You'll need the Plasma Cutter and the Force Gun ASAP. This is an incredibly frustrating achievement, but if you do it right it will only get easier as you go along.

Dead space 2 chapter 15