We're giving away flights to Japan as a prize to help promote the site, users can accept challenges for the parent competition or sub-competition we are getting rolled out with partner brands.
Here is an example of how that works:
The parent comp
[Imgur](http://i.imgur.com/mXOoXtK.jpg)
And an example child comp
[Imgur](http://i.imgur.com/byOwy3b.jpg)
Just thought I'd share it here. I've been doing this for a while now, have some pivot ideas that we're testing right now.
Regards, Thomas