Okay, I just did this and will try to point you in the right direction. Sorry if I'm saying things you already know, but -- This is kind of like the puzzle where you move tiles to line up a picture or numbers in the correct order. If you look at the floor tiles, you'll see that each has an arrow pointing in some direction. That shows that when a tile is on fire, it will light the one next to it in that direction. In other words, if a lit tile's arrow is pointing to the right, it will light an adjacent tile on its right. So, you need to move tiles by right clicking on them; a tile can move only to an adjacent empty square. It helped me to look at the arrows at the end and try to figure out how to move the tiles to get the right path. It took some trial and error, but I did not find it too hard. I hope this gives you the kick start you were looking for.