This is a great game where you have to put the tiles in the correct order.
There's a little flaw, however, that someone pointed out and I (think I have) experienced too.
In some levels, some tiles have to be placed in specific places or the order won't be accepted even if it's correct.
Apart from that, it's a great game with some calm music!
Hey reader, you don't have to use the walkthrough! I'm not saying it is too easy, but the game itself is so calm and smooth that you'll have plenty of time to discover the answer yourself ;)