Quote Originally Posted by SilverWarior View Post
As far as I know all starting configurations of sliding puzzle are solvable.
True, unless the starting tiles are messed up. E.g. like here





I haven't done the math myself and I'm not going to try digging into that but from what I understand start postions like that really are unsolvable.


I made an updated version (0410) to demonstrate what I mean. Download the new version. Click the Mission Impossible button and you get the teal coloured background and a supposedly unsolvable start mode.


The normal solvable modes are still there of course.