I had no idea what to expect when I bought Prime 2. I just knew that I loved Prime and even if it was a rehash of the same game I would love it. I think it's great so far, and the addition of the Light/Dark parallel worlds is great. It's a lot harder too. I find myself dying way more often than the first one. I just spent a good couple of hours trying to beat the slug/moth thing and probably an hour on the boss before that.