Space Tris - Space Tetris Game
MOVING A TETRIMINO:

By pressing left and right
arrow keys, you can slide
the falling tetrimino from
side to side.  
(Objective...Move the
tetrimino so it hits both
sides of the matrix).

ROTATING A TETRIMINO:

By pressing the UP arrow
key, you can rotate a
tetrimino 90 degrees
clockwise.  
(Objective...Rotate a
tetrimino a full 360 degrees
clockwise).

CLEARING A LINE:

To score points in Tetris,
you must clear lines.  To
clear a line, every square
in a row has to be filled.  
(Objective...Rotate and
move the tetrimino so that
it clears the bottom line in
the matrix).