I'm not aware of a tetris game with sourcecode that has been made by a PGD member, nor do I know of a tetris clone or -tutorial that has been reported to PGD or Turbo in the past few years. I believe your best option in this case is google.

Although I might add that tetris isn't the most difficult game in the book. If you are not the beginner you say you are then I'd suggest you give it a go before looking into other peoples code. You'll learn so much more that way.