Secret Maryo Chronicles began as a SourceForge project in January 2003. It was developed and is maintained by the Secret Maryo Chronicles development team, led by Florian Richter ("FluXy"). The game is OpenGL-based and has an original soundtrack and a built-in game editor. It has been released under the GNU General Public License, Version 3. The game has been expanded up the latest release in 2009. A continuation called, The Secret Chronicles of Dr. M. (TSC), is of April 2017 under continued development.
Secret Maryo Chronicles was listed as the number one open source video game by APC in January 2008. The game was named one of the most promising open source games of 2008 by El Heraldo. In 2008 Stern praised the speed of the game and its puzzle solving , and heute praised SMC as a well-made non-violent game for children.SMC was selected in March 2009 as "HotPick" by Linux Format.
SMC became a popular freeware titled offered by many freeware download outlets; alone via Sourceforge.net between 2004 and May 2017 the game was downloaded over 3.4 million times.