1. Switch Online’s DK Challenge Now Offering Physical 39-Card Set Reward  Nintendo Life
  2. Complete the DK Challenge and grab a fun physical reward  Nintendo
  3. Nintendo offering physical Donkey Kong cards for completion of DK Challenge by September 1  Nintendo Wire
  4. DK Challenge revealed for Switch Online, physical cards announced (UPDATE)  gonintendo.com
  5. Nintendo reveals physical reward for completing the DK Challenge  Nintendo Everything