I'm planning on picking up a used copy of Policenauts for cheap (as well as Assault Suit 2) this weekend, but I want to know how playable the game is, and if it's worth picking up at all. I notice that Policenauts uses a lightgun (which I don't have). Are the shooting portions of the game that amazing that I should try to hunt down a lightgun, or will the A-stick on my NiGHTS pad suffice? And what are your thoughts on Policenauts overall (for thise who played it)?