PMEquator 0.1 is an educational game for equations (1995-Jul-09). Now Released as Freeware and Open Source.
http://hobbes.nmsu.edu/cgi-bin/h-search?key=pmequator.zip
Soon all this files will be also available at the OS2World Gaming Site (comming soon!)
I will like to give an special thanks to Frank Nestel for making his game Open Source.
Source: