Using the Ghost Piece
The Ghost Piece shows where the current Tetrimino will land if you don't move it or rotate it. Use it to line up where you want the Tetrimino to go.
Use the Ghost Piece to position the Tetrimino to clear two lines at once.
Using the Next Queue
The Next Queue shows the Next Tetrimino that will come into play. Use it for a quick look at what is ahead.
Position two Tetriminos to clear three lines at once.
Holding a Tetrimino
If you can't find a place to put a Tetrimino, hold is using the SHIFT key. To get the held Tetrimino back later, push the SHIFT key again.
Hold a Tetrimino and then use it later to clear four lines at once.