A motley crew (of autonomous programs), a peaceful (if perhaps mysterious) mission, and no enemy vessels for lightyears around—what could possibly go wrong? Just about everything, as it turns out. And after a strange midflight disaster knocks out most of the ship's subsystems (sabotage, perhaps?), you'll have to guide Mezure—the plucky new administrator process—and the rest of the crew to repair the damage. But beware—not all is as it seems aboard the H.L.S. System.

System Syzygy is a story and a puzzle game, in the style of Cliff Johnson's classic Macintosh games The Fool's Errand and 3 in Three, and of Andrew Plotkin's System's Twilight. As you move through the game, solving a variety of different kinds of puzzles, the game tells the story a piece at a time. By the end of the game, all the different puzzles and pieces of the story come together into a single meta-puzzle.

System Syzygy is Free Software, in both senses of the word: you can download and play it at no cost, and you are free to redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.