Kasper Peulen, a student at the University of Amsterdam, has taken some compass and straight-edge constructions and used GeoGebra to create an online game in which students perform constructions to work their way through levels of the game that gradually increase in difficultly. It's a fun way to help students learn the tools of construction in GeoGebra and strengthen their reasoning skills in geometry.
Try the game yourself at http://euclidthegame.org/Level1.html
But be careful: the game is pretty addictive!
Thanks to Noyce Master Teaching Fellow and Scottsbluff High School teacher, Shelby Aaberg, for sending us this link.