Defense against The Dark Arts:
Finish the opening level.

Unlock Dugbog Bulb Raid mini-game:
Collect five Tri-Wizard Shields.

Unlock Exploding Snap mini-game:
Collect two Tri-Wizard Shields.

Unlock Moody's Challenges:
Complete the Forbidden Forest level.

Unlock Niffler Time Challenge mini-game:
Collect eight Tri-Wizard Shields.

Unlock Wizard pairs mini-game:
Successfully complete level 1.