I have a few quick notes I want to add to the video.
First, you can only click the tiles that aren't dimmed. These are tiles that have no tile on top of them, and are not blocked on both the left and right side by a tile. Somehow I forgot to mention that in the video.
Also, I want to make a quick apology for the rambling nature of the video. I recorded it one night at 4 in the morning while suffering from insomnia. I think it still does a decent job of telling you how to play, so I'm sticking with it. :^)
Thanks for playing,