I was able to figure out the other puzzles pretty easily. Dots = 1, half circle = 4, etc... but then I got to the 4x4 sliding square tile puzzle with the three unmovable green tiles and the hint in the corner with the red X's which makes no sense to me no matter what I try to assume it means. With the other puzzles I was able to move stuff around and see what worked and what didn't work and then decipher why those moves worked. But with the sliding square tile puzzle no mater what or how I move the tiles nothing lights up or changes or gives any indication that I did something correct. At this point I wouldn't mind flat out being told what to do, but if you can at least give me a hint on how to begin solving it, I'd appreciate it. Thanks!