Tetris Help

Game play: power-ups
For every 4th line you manage to clear, an attack or defense power-up will appear in your board. If you clear a line containing a power-up, the power-up will be added to your list of power-ups (shown in the center). You can use a power-up by pressing the appropiate key. If you use a defense power-up, a line will be cleared from your board. If you use an attack power-up, a line will be added to your opponent's board.

Controls
NumPad 4 / Arrow Left | Move piece left
NumPad 6 / Arrow Right | Move piece right
NumPad 2 / Arrow Down | Move piece down
Spacebar | Drop piece
NumPad 5 / NumPad 8 / Arrow Up / Left CTRL | Rotate piece
A | Use 'attack' power-up
D | Use 'defend' power-up
S | Toggle sound on/off (currently not implemented)