Originally Posted by InfestusAquila
The best way I find of completing Impossible the first time is to just use the Plasma Cutter. This limits you to only buying Plasma Energy and helps you to spend more money in Med Packs and nodes to upgrade your Rig and Stasis (which are crucial). In fact, I got the One Gun achievement and Epic 3 Tier Engineer on the same play through.
Sorry for the vague tip but if someone has already mentioned it then they know what they're talking about.
Yeah I'm playing through on Impossible with only the Plasma Cutter for my first time too. It's not too bad except I can't seem to beat the level 6 boss for some reason. Guess it's because I mainly play Black Ops and just am not as good at DS as I used to be. Just plan to peng treasure glitch to get enough nodes to upgrade everything at the end of this playthrough and I should have 1k finally.