Winner will receive a serial key containing only numbers and dashes. The format is like: 11111-1111-1111-1111-11

Yes, that does look pretty weird, but it will redeem on Steam as "Dominions 4 Thirdparty Retail" (subid 35357).
Please note that you need to copy the key EXACTLY as it is (KEEP the dashes, NO spaces -- for example if you triple-click at the key section it may include spaces, but you don't want them), otherwise it will show up as "Invalid Product Code".

Ends on: Dec 20, 2016 5:00 pm (UTC-5). Level 7+ public.