I disagree. I definitely prefer Peulen's implementation, but I do like some of the additional challenges.

Kasper, if you're still here: That's brilliant! - also, there goes my evening... :)

So - the reason people keep saying "ooh, Java" is because the deploy you're using does, in fact, give the java version to some people (I noticed it myself). It apparently does a bit of browser capability sniffing, and deploys a java applet if the user has java installed, html5 if Java isn't available (because yes, it…

I use the html5 version of geogebra no java

I LOVED Deductive Geometry in High School.

Learning through gamification!

Oh my god, construction exercises. It's the intersection of the concepts of "addictive" and "frustrating" that Rubix cubes, Civ games, and 2048 have so comfortably occupied.