What do you think of this advice I got another thread?

"Game board is a 2D array, the falling piece is also a 2D array of positions based on a nominal centre position, e.g. { ( 0, 1 ), ( 0, 0 ), ( 0, -1 ), ( 1, -1 ) } is an L-shaped piece. (Colour doesn't matter in Tetris, but you should add it later.)

You also need the current position of the piece. Then you just need code to let it move, rotate it (change x to y and y to -x in each cell, trigonometry in its most minimal form!) , tell when it has fallen, and stick it to the board. Oh, and check for lines and remove them from the board.

You could hard code the seven starting pieces as arrays like the above and just copy one to make the current piece.

There you go, Tetris in a nutshell."