Pair Matching Puzzle Connect

Once you get the hang of it, it's pretty cool as a concept.
I love the puzzles and have most of the DLC items, but please fix the issue where there are four squares left with no match, yet it refuses to mix them up in a manner which allows the game to continue. To complete a level you need to clear several screens and to have this happen over and over is just maddening. The randomising of the last 4 tiles should repeat if the tiles are still unable to be matched. I understand that the code that randomises tiles is doing its job, but where you have just 4 tiles left and the tiles are randomised to STILL make a match impossible, is pretty bad. I don't know how this would be done from a programmer standpoint, but to have a game breaking bug like this, is pretty unacceptable. There is obviously code to check that matches are possible, so why does this fail when there are only 4 tiles on the board?
Other than that it's a great game.
Note: It is IMPOSSIBLE to finish the classic game. After completing ALL of the games, it just goes back to level 19 - even after beating level 7 of the last round in the classic. This is a shame.

I don't know what some of the functions do since there's no tutorial or help. Like the "heart #" between the time and level - no idea what that means.
Figuring out the game mechanics isn't very difficult. The game has many levels and variations and it's a good time waster which is why I bought it so it does it's job there.

Nice little game. Good for some fun when you're bored