You can also purchase individual tiles which come in handy when you need to fill in a hard to reach space or add one more row to reach the corner. (glasstileoasis.com)
They've been gradually releasing individual tiles which when put together create one large image which you can see above. (wolfsgamingblog.com)
You can move individual tiles around to make sense of what you're looking at as you try to solve the puzzle. (leveldowngames.com)