What is "notrium"

Notrium is a freeware video game for Microsoft Windows. It is developed by independent Finnish programmer Ville Mönkkönen. It is the seventh game by Mönkkönen, but only the fifth to be released fully in English. Released in 2003, it won second place in the "Adventure Game of the Year" contest on GameTunnel. Notrium's source code was released by the developer after 2003 under a custom open-source like software license. It is developed as OpenNotrium on GitHub, with new code being GPLv3. Following that, the game was ported to many other platforms ( Linux etc.), also mobile devices like the Pandora. On Dec 8, 2015 a "Notrium Special Surprise Edition" was released commercially by the author in the digital distribution adding some improvements.