So I guess to be completely clear. I agree there needs to be restriction of some kind. I can see not wanting to let me get to the top of a mountain, and for the most part I have seen a pretty good design on making certain parts of the terrain impassible. Good job there. I can see putting a turn back now warning if I get too far out into the water, getting towards the edge of the map. I can also see making things too high for me to jump to. I think that is smart design, and should be continued. I understand that there are limitations on hardware and not being able to render too much at the same time. I disagree with what has been mentioned about the extra ram needed to open up some of those levels a little more. The biggest thing with the ram is having to render and keep those textures in your video memory and process them. If I can get on top of a building, see that everything is rendered just fine and it still gives me the turn back now warning even though I am well within the playable area is what I don't agree with. I hate to compare, just because I know that different game engines are just that, different. Infamous has a very detailed open world with no invisible ceiling. Just cause 2 has a massive and detailed open world that allows you to go thousands of feet in the air. There are limits somewhere, I know there are, but you can't really tell where they are. I am only saying this to clarify my point. I just think are are better ways to restrict movement. More natural feeling ways. Less obvious ways that will actually add to the immersive qualities of the game.