The minimum to progress is 60%, you should be ok to go. The percentage won't change, so you can get it to 100% in replays, if you want to. 100% first run isn't impossible, but it depends a lot on your stats.
I'm just stuck in puzzle. Can you please tell how to progress further or end the puzzle or where to go to get out or something. I think i roamed every room. It's the info gathering from chapter one. Or is there any particular location I have to go to progress the story ?
