Really great concept, filling a board with one tile proved to be easy at times, though some certainly stumped me, and theres room for even more complexity. If this were on an app store its something id pull up on my phone all the time to pass time.
My original plan was to have more grid types (like triangular and hex grids), so that would definitely add some complexity. I actually thought about releasing this in the play store, lets see. Thanks for your comment!
