Shovel Knight is an indie game developed by Yacht Club Games for the Nintendo 3DS & Wii U. The digital version of this game requires an update in order to use amiibo.
If you scan a Shovel Knight amiibo on either version of the game (via Wii U Gamepad, New Nintendo 3DS or the Nintendo 3DS NFC Reader), you can customize & level up your Shovel Knight with new armor, abilities and relics. You also unlock exclusive, amiibo-specific Challenges, focusing around the new abilities and relics.
Exclusive to the Wii U version of Shovel Knight, you can unlock co-op mode. Co-op mode not only allows two players to take on the story mode and Challenges, but players can each use their customized Knight to play.
Below is a list of all amiibo compatible with Shovel Knight.
This amiibo can be leveled up & unlocks exclusive challenges, items & co-op mode (Wii U):