The Atari Tetris Emulator in Java - Norbert Kehrer (October 2001)
The keys:
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Left: Move left
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Right: Move right
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Down: Move down
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Ctrl: Rotate, Start
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3: Insert coin
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Keypad +: Increase frame skipping rate
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Keypad -: Decrease frame skipping rate
Hint: To start, insert coins and press the button (Ctrl key) several times, until game starts.