Enchanted Blocks are a platforming mechanic exclusive to King of Cards. They're only found in ????.
Enchanted Blocks are purple 1x1 blocks that disappear after King Knight jumps or Shoulder Bashes off of them. They completely replace the invisible blocks that appear in the previous versions of the stage found in the other three campaigns. Unlike Dirt Blocks, they cannot be destroyed using Heirlooms or King Knight's spin.
Enchanted Blocks also appear during the boss fight with the Enchantress, where they replace the Dirt Blocks from the other three iterations of her fight.