That was fun. My usual technique of making a "train" of letters to slide and then attach a caboose didn't work. So I flipped my phone upside down and acted like

That was fun. My usual technique of making a "train" of letters to slide and then attach a caboose didn't work. So I flipped my phone upside down and acted like I wanted to make the word WON at the top. I did then did the rest of th puzzle, finding out the difference from a normal 15 puzzle along the way.