Buy 1 Large Traditional/Gourmet Pizza & Get 1 Free (Excludes Impossible & Half 'n' Half) + Add Any Toppings Free @ Domino's App
CODE: 33341 (Buy 1 Get 1 Free)
Got the email yesterday (Tuesday) but didn't mention about any added toppings will be free so done a few examples 1 with the code and 1 without the code with added toppings.
Also Thin n Crispy seems to be free as well when you change the base.
Not sure if its every store but worked for my local stores in Hawkes Bay.
Heres a couple screenshots: