I’m a sucker for original concepts. I don’t know if you came up with this yourself or borrowed it from somewhere else, but it was new to me. I thought it was cool that I sometimes had to discover that what looked like a single piece was actually multiple pieces. I also liked that I didn’t have to undo multiple steps in order to pull a piece from a lower level. It seems like there are plenty of opportunities to take this idea further, or even make new games based on it, but I really enjoyed this one.