Received an email from KK about their competition (game), and played it. Received this code, which entitles BOGOF dozen doughnuts. The code is generic, so can be used multiple times.
Add two dozen to your cart, then apply code and you'll see $17.95 deducted from the total
Order online and collect instore!
Krispy Kreme Click or Treat - Win a Buy One Get One Free Voucher
18 Oct: Now available in WA (thanks Spackbace)
I don't think the code is generic