I tried witness, but, just have up after a while. Too much running around and if you miss the hidden paths etc it can be totally frustrating. Just like that darn door in riven that started open and you had to close it once inside to find the hidden passage. I dunno, I just find that frustrating. Shadow puzzles when not really that clear, also frustrating, even when you know what you're supposed to be looking for. Myst on the other hand, loved it all.