Datamind.com whom I interact with on and off, and also the masterminds behind http://www.rdocumentation.org/
have finally created their platform for interactive and gamified R learning on the web. Take a look- it does like slightly better than Codeacademy’s interface doesnt it. The platform is called http://www.r-fiddle.org/#/
More power to R for Cloud Computing!
Now if they could only collobrate with other players like Quandl, BigML and even StatAce for a even cooler suggestion. Even Revolution Analytics and RStudio who have very expensive training modules should be able to use this for self paced online learning courses!
Quote- A software of beauty is a joy forever – Keats
DECISION STATS 
excelent