It took me four or five hours to play through the free browser gameSeedling, and another two, most likely, to untangle the experience afterwards. It's a pretty clever game, really, using familiar mechanics to pull a rather unusual trick on its players. I'm not going to tell you about the trick, because that's ultimately something you should find out for yourself. I am going to tell you about that familiar stuff, though - the stuff which is a significant achievement in its own right.