10 Extra Lives:
Press select, then press button B, A, B, A, B, B, A, A.

Flipendo Spell:
Prof. Quirrell teaches the Flipendo. It is a spell that shoots a ball of energy in a straight line.

Alorah Spell:
Hermione teaches the Alorah spell, which unlocks chained doors.

Better Ending:
Get all 15 chocolate frogs to get the last ending.

House Cup:
Get at least 524 house points to win the house cup.

Kill Troll:
If you were wondering, you can kill 2 trolls. Use wingardium leviosa on the ones in the forbidden forest when they growl.

Thanks to Revolution readers ashley, Tom, mike and Heely's Boy 808!