I've added the code card to the checklist. This is the first time since the 2016 set they've done the crack the code contest. I looked up a bunch of the cards on ebay and could not see any difference between the cards so it looks like only the one type of card. One yeart the code card inserts were how you cracked the code. From the box breaks i've seen these aren't one per pack but there are a couple per hobby box and blaster. Still haven't specifically seen any cards in the set that would point to special code cards, also from year's past, but it looks like from the code master on twitter there are clues in the set, somewhere.