Heureka Klett was a German software engineering company which has made several personal computer games of the sort called "edutainment".
They are point-and-click puzzle-adventure games, heavily inspired by Myst for Windows and Mac.
On June 1, 2005, Heureka-Klett sold its edutainment software to BrainGame Publishing.
[1] Seven games in the educational series collectively sold over 500,000 units and won numerous awards.
[2] Before turning to edutainment only, Heureka-Klett also published a school version of The Interactive Geometry Software Cinderella.