Sorry, when i uploaded i didn't check the button to allow open in greenfoot checkbox. I will fullly doc the scenario and upload soon.

The resetting of the level is done from within the Hero class when he dies, the level is drawn but the Ghost class and Hero class are not redrawn. The only thing i can think of is the call to redraw the level is from the Hero class or the Hero and Ghost constructors have parameters. As for needing more paths, what do you mean ? .

Very nice, i wrote a box game like this in Borlands c free version many moons ago. At the start of the game i generated random tile positions until i realised mathematically some random start positions were unsolvable. I solved the problem by randomly moving tiles from there original position and then displaying the puzzle so it was always solvable. Nice graphics as well. Good work.