[quote name='fattychubs']There is no restriction on joining challenges in any tiers. You can do multiple tier 1's if you like. Although you can only win each tier once. So if you win a Tier 2, you would be locked out of competing in Tier 2 and would have to try a different Tier. However if you don't win you could do back to back tier 1's if you wanted to.[/quote] And once you win a tier 1 you cannot join another tier 1.
[quote name='"http://blog.360voice.com/2007/11/the-old-spice-e.html"']So the way you have to think about this is you can choose to do lots of short tier 1 challenges, or you can try the longer challenges with bigger rewards. BUT, you can only win 1 reward from each tier... so if you win a Tier one challenge, you will be UNABLE to participate in another tier 1 challenge. You will have to be in Tier 2, 3 or 4.[/quote]