Looks like it was more of a trick than a treat.
Looks like the Stampii Trick or Treat game was a little too tricky. The company has announced on their facebook page that since there were some problems to get the Sonic Mystery Card on Halloween as the SonicHalloween bot did refuse the offers from most of the users, the Sonic Mystery Card #1 will now be available as a regular card.
You will have the chance to get is while you buy your regular Stampii booster packs, although it might be a little hard to get.
And not only that. The company also teased the next Sonic Mystery Card. They said it will be released in mid-December, and it will be Christmas themed.
While you wait to Christmas to come…go trade Stampii cards, and get that tricky Halloween card!