Hats in AudioWizards

Hi
Some people is wondering about how to get the ten hats in AudioWizards, and we would like to help a little bit with it. Here is the list of hats, how to get them, and what they give.

Apprentice's Hat. Unlocked by default
Effect(s): None

Tea Dispenser Hat. Unlocked when receiving Tea from Saundaman x times
Effect(s): 20% more likely to encounter Saundaman whenever he has change to spawn. 5% Score Bonus

Hard Hat. Unlocked when beating level 5 "WARNING: DANGER LEVELS AT MAX"
Effect(s): Start with 2 extra Lives. 5% Score Bonus

Supercharged Hat. Unlocked when using Super Spell in Endless Mode a certain amount of times
Effect(s): Start with 100% Super Gauge. 5% Score Bonus

Undo Hat. Unlocked when using wrong spell in Endless Mode a certain amount times
Effect(s): Cancel chosen spell by swiping down. 5% Score Bonus

Jester's Hat. Unlocked when killing Tricksters in Endless mode a certain amount times
Effect(s): Shuffles Spell Order similarly to level 12 "This Is Getting Out of Control!". 50% Score Bonus

Mezafort's Hat. Unlocked when killing Saundaman in level 13 "Hot Tea in the Cold Winter"
Effect(s): 8% Score Bonus

Principal's Monocle. Unlocked when beating level 20 "The True Final Battle"
Effect(s): Changes the background music to "Principal Prime". 10% Score Bonus

Sunglasses. Unlocked when beating level 11 "The Super Spell"
Effect(s): Disables gameplay visuals. 20% Score Bonus

Master Wizard's hat. Unlocked when getting 3 stars in all levels.
Effect(s): Can't gain Lives. Start with 1 Life. 100% Score Bonus

If you have any comments, we would love to hear them.
Anyone got all of them?
Which one was the most difficult?
Which one you use to get the highest score?

Regards