Enigma
released on May 25, 2007
Enigma is a puzzle video game based on Oxyd, and is released under the GPL. Enigma continues to be very popular as an open source multi-platform derivative of Oxyd now that Oxyd is no longer maintained. The open source fangame Enigma has been praised in reviews. Enigma is a marble game.
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Greatest puzzle game ever made. You will never need another one after this.
There are 2907 levels in Enigma. Nobody has completed all of them. Truly mindboggling in scope and density. Playing it is like trying to clear a glacier with an ice scraper.