grendle:
its been down for me for the last few days.
Playground has been moved some days ago to a new (and actually dedicated) small server, to experiment with new hosting solutions for our growing community.
I've already collected some complain about unability to reach the website, but given that incoming traffic is still high (almost the same as before) I can assume the issue afflict only a part of the users. The problem is understand which part, and why.
If someone has some competence in networking, is experiencing difficulties to access playground.arduino.cc and want to help and act as case study to debug the situation, please get in touch by mail at webmaster@arduino.cc