Talk:Three-Day Math Points Challenge/@comment-25304012-20141024220105/@comment-25297120-20141025032530

Sadly, we stopped offering 3-Day Challenges because they weren't as effective at getting people to learn more as we'd hoped they'd be. It was a bummer for me as the person working on the feature, but I think probably the best decision for Khan Academy users at the moment, since we have limited resources and need to focus on making existing features better. Stephanie Change

So, it is retired.