Just curious, how hard would it be to implement some 'Climbing' in the game? I am thinking of something where it is only in certain areas, kind of like the Lara Croft games. In those games, some jumping is in the game, and some climbing, but not everywhere. There might be some areas where climbing up a cliff of vines to a plateau might help us, or climbing up some roots would lead us to new areas. :)
