Magazine Publisher: Amigo! Issue 1/92.
Magazine Publisher 2: Amiga Fun Gold Edition (DE) #1, 1993 [download HERE].
 English instructions are contained in-game.
 ***TETRIX (full release) *** is available for download HERE. [Source: Back to the Roots (old website), courtesy of EAB FTP site]
TRIVIA: A fake sequel Tetrix II was released to the scene in 1994 by Hawkeye Soft, who were notoriously lame for hacking other PD/shareware games that year (e.g. MEGABALL 3) and taking credit for work that wasn't their own (see HERE).