Talk:Challenge/@comment-7996849-20140813210222/@comment-1824272-20140813211032

We're still learning about this system as the event goes on. It looks like you need to finish any one challenge in the 2.x tier to unlock the 3.1 challenge, but you only need to finish any two challenges in the 2.x tier to unlock 3.1, 3.2, and 3.3. Same for the other tiers. It looks like you don't need to complete all three challenges in one tier to progress to the next one.