How to play tetris

First! Yoy need a keyboard! :)
Tetris Game is a puzzle with the shapes each consisting of several squares, that are falling down the well. When playing a tetris game, one turns them or moves left and right, trying to arrange the shapes in a line. When a line of squares makes a line from edge to edge, it disappears and all the pieces move down by a square. When the well is filled up, the player loses.
Seems like it's quite easy to play tetris game, but as levels progress, you feel that playing tetris game may be a real challenge.

Types of tetris pieces