WOW Trophy

This is by far the hardest trophy in the game. You need to earn 36 stars on Legend difficulty (this difficulty is unlocked when you reach 40 stars on Hard), on this difficulty you don't have power-ups which forces you to take risks getting the multipliers.

My tactic: at the start of the song drop as many blocks on the beat as you can, now DON'T continue dropping on the beat, just let the blocks fall (this way you'll keep your multiplier). Only manually drop blocks on the superbeats, to get a 4x or 6x multiplier.