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Has anyone tried CheckIO?
Zubair Akram's profile photoAlexander Lyabah's profile photoMaksim Sokolski (maxsocl)'s profile photoKlop King's profile photo
I just registered and did the first exercise.  Looks like a lot of fun!
Doesn't work on my Samsung galaxy s2 stock browser or mobile Firefox.
It's brilliant. Thanks for the link. I am recovering from knee surgery. That's exactly what I needed to spend the long days. 
Just looking at it now... it's interesting but seems to have a very poorly written dialogue, which is a shame because it makes it less engaging.
And just released 3.3 version of python are used too. Have a fun!