All artwork, sounds, audio, screenshots, text and code in Natural Selection, Zen of Sudoku, Spark engine and Natural Selection 2 and on this site are Copyright © 2012 Unknown Worlds Entertainment, Inc.
The mark Natural Selection was first represented in association with video-game software in June of 2001, and was first used in commerce around January, 2002. Natural Selection is Registered with the U.S. Patent and Trademark Office (No. 4,179,393).
The mark Zen of Sudoku was first represented in association with video-game software in April of 2006, and was first used in commerce in June, 2006.