I have reproduced a B&W version of the classical game TETRIS running for either NTSC or PAL composite TV output.
No needs of special game shields or further supporting IC, but only a bare Arduino Uno and few other components (buttons and resistors).
It is a "conversion" plus some improvement of my previous color version for VGA monitors, shown here:

https://www.youtube.com/watch?v=qI0yp16fogI

Finally I put the Arduino in a pre-existing box with buttons I got from some scrap, but you can built your own as you prefer.

Code and instructions will be available here:
http://www.instructables.com/id/Arduino-Tetris-TVout/

Автор: MissBurpool