A clone of the Tetris game. Documentation for the commands is on-screen. The optional argument is an initial delay loop count between moves; on 2003-era personal computers it needs to be set to about 75,000.
Originally written by Quentin Neill. Visual user interface and color support by Eric S. Raymond <esr@thyrsus.com>. The ncurses version was written in November 1994. See http://www.catb.org/~esr/tetrix/.