They are a key part of the gameplay and you need to catch them to progress. Here's how:
1. Use the character with the "catching" ability: This is usually Harry or Ron, as they have the "Accio" spell that pulls objects towards them.
2. Aim your reticle: Use the Wii Remote to aim at the flying keys and lock on to them.
3. Cast the spell: Press the "A" button to cast the spell and catch the keys.
Let me know if you have any other Lego Harry Potter questions! 😊