Bash and SED script to play...Tetris...?

If you navigate your browser to here, you will find a most amazing thing: Tetris crafted out of a SED script with a bash wrapper.  The page is in Russian, but Google or another translation site will tell you that the first few words read:

Wrote a small Tetris on sed’s: sedtris.sed and wrapper on Bashe sedtris.sh Download both scripts to the same directory, on the command line do:

bash sedtris.sh

It’s actually very good!