The Event’s additional feature – the Special Orders List.
After Dueling in Duel World, Duelists may drop a “Special Order” in addition to Security Badges. These are event missions that offer additional rewards such as EX Jewels and Gold. Completing 100 Special Orders throughout the event will unlock an additional reward.
The orders vary from using certain kinds of cards enough times to destroying enough monsters, to just obtaining Gems in Duel World from the environment interactions (trash can, shop sign, etc).
The Special Orders List can be accessed by clicking the event icon (the giant floating Security Badge), then clicking the Special Orders List icon. Rewards are claimed from there, then sent to the Gift Box to be claimed permanently.