Secret Rockets
Secret rockets are found in both type games. The type A game will show a small rocket when you hit 100,000 points and a large rocket when you hit 200,000 points. The type B game shows a space shuttle taking off when you beat the game at level 9 and height 5.

Secret Ending
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.

No Preview
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.

Harder Game
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.

The speed should increase ten-fold
On the title screen, press and hold Down. Now press Start.