Tetris GBC cheats

At the Gameboy screen press L, R, Left, Right, Up, Down, A, B, Start, And Select, in that order quickly. The game will now be blue

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Hold Down and power on the Game Boy. Keep holding Down, then press Start at the Title Screen to begin game play at 10 levels ahead of the level that was selected. A small heart will appear with the level number.

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Press A + B + Start + Select during game play.

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Rockets will appear after completing a level 9 height 5 B game or passing 100,000 and 200,000 points in a type A game.

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Press Start to pause game play, then press Select. The preview window will not show the next piece when game play resumes.

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At the Gameboy screen press L, R, Left, Right, Up, Down, A, B, Start, And Select, in that order quickly. The Screen is now Blue (Secret Glitch)

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So when the gameboy sign apears press the buttons and it should change color. There is also a way to get it rain-bow color but I don't remember it

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