Bicolor Tiles is an interesting puzzle app game. The object is to fill the board completely with tiles. I have not solved it. As best as I understand it, every tile must have a unique set of neighbors. The neighbors being the surrounding 8 tiles. Tiles on the border have fewer neighbors - it seems. Or do they? I think the 3 absent neighbors count.
I'd be more inclined to solve this puzzle if the grid were smaller. If you manage to solve this, please leave a comment.
Vladimir Golovnev has been producing some interesting puzzle app games recently. Numbermania is probably his best.