3D GameLab is a new site that I just learned about that is ideal for introducing Game Based Learning to the classroom and reminds me a little bit of Answerables. They actually use something called "quest" based learning which has students completing "quests/lessons" and earning digital badges while leveling up. Also, it helps incorporate self paced learning and is a fun way to engage students on any subject.
Below is a brief demo...
I highly recommend checking out 3D GameLab by clicking here!!!
For a more detailed review check out Graphite.
For my Pinterest board on Game Based Learning click here.