Tetris Cheats (GameBoy)

To play a harder game where the next piece is not shown, hit START during any point of the
game. While the game is paused, hit SELECT. When the game is restored, the box where the
next piece is shown will be empty. To show the pieces again, repeat this process.

On the title screen, press and hold Down. Now press Start.

In Tetris mode B there is a special level ending. To earn it score 25 lines on level 9,
with the initial height set to 5. If you're successful you will be rewarded with new
music with Russian dancers and musicians prancing in front of the title picture.

There are actually four rocket. There are three rockets easiblty attainable.
  True, the first is at 100,000 points. This one should be the single stage rocket. 
  At 150,000 there should be a two stage rocket or a double-decker rocket.
  True, there is also a rocket at 200,000 points. This should be the three stage rocket. 
  Should have what appeas to be lunar lander on top.
  And somehow I have achieve an ending where the Palace takes off.
  I have scored over 400,000 three times and that does not seem to be the criteria to do
it again.
  I cannot find the original source that told of how to achieve the ending.
  I am left to assuming it has to do with a number of Tetrises achieved in sequence or
total.
  I am hoping you can aid in figuring this out.

At the title screen, hold DOWN and press START. When you start your game you will see a
little heart by the level and the game will run much faster.