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+        This is a Unix SysV implementation of a game that appeared on
+comp.binaries.amiga a while ago. The author, Quentin Neill,
+saw it on an amiga here at work, and ported it to curses 
+(on his own time, of course ;-)  ).
+       I'm not too sure about the history of tetrix.  Someone 
+said that the game originated in Russia, and that it is quite old.
+We became enthralled with the game on an Amiga, almost to the point
+of addiction.  That version had some documentation, but I never had
+the chance to read it - I only played.  I considered writing a version
+in machine language for my Franklin junker at home, but settled on a
+C implementation for unix machines.
+       The object of the game is to keep the board clear for as long as
+possible.  Pieces consisting of four blocks (hence the name TETRix) in the
+seven possible arrangements are sent down one at a time.  The player's
+job is to find the best fit for the piece in the pile of blocks that have
+already fallen.  He can rotate each piece and move it from side to side.  
+If the piece just played causes a complete row of blocks, that row is 
+erased and all blocks above it move down one row.  Points are awarded for
+completed rows - more for rows higher up on the board.  A piece may
+be dropped from a height for additional points when the player feels it 
+is oriented correctly.  The game is over when no more pieces can be formed
+at the top of the board.
+       There is one variable INIT_PAUSE in tet.c that compensates for
+different machine speeds.  Set this higher if tetrix screams, and the 
+time between each piece's movement will lengthen.  Set it lower if
+it crawls along too slowly.  On a Tower 32/800 with about 45 users on a
+busy day, we do well with the value set at about 300.  On a Tower 32/200
+with one user, the value was set at 1500.
+
+       Good luck!                                      Quentin Neill
+
+This version has been hacked to do color under System V Release 3.2. Compile
+with -DCOLOR to enable this feature. Due to the limited number of colors in the
+curses(3) portable set, 'tan' pieces will be cyan-colored.
+       If you're using an EGA or VGA display, however, you can also compile
+with -DEGA to get better colors (this uses the EGA quirk that yellow is
+'bright brown').
+       Finally, note that you may now invoke tetrix as `tetrix <pause-value>'
+to set the value of INIT_PAUSE.
+
+       Have fun!                                       Eric S. Raymond