Agreed, I thought I had it cracked when I noticed that I just needed to get the spacing right on Easy, but man the difficulty is a cliff going into medium.
EDIT: Oh Ok, Medium isn't that hard either, much harder than easy though, just figuring out the last "row" is to toothsome part.
Easy and Medium are doable. Hard is when the challenge begins!
I'm still trying to figure out how to flip the last two tiles in Medium. The rest of Medium is easy, but that last step is hard.