|Einstein Puzzle is a free game. This means that the source code is available to be studied, modified, and distributed. Most projects look for help with testing, documentation, graphics, etc., as well.|
Einstein Puzzle is a puzzle game based on an old DOS game called Sherlock, based on the “zebra puzzle” or “Einstein’s puzzle” (which is often thought to have been invented by Albert Einstein) and written using SDL. It licensed under the GPLv2.