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A Poster Promoting a Special effect where players could play Hard Rain on "God" difficulty.

From the page:

Period: Thursday, September 15, 2016 8: 00- Wednesday 12th (Wednesday) 23: 59

Summary: Expert is not satisfiying anymore!

Information: For those players with confidence. We will be delivering this co-op difficulty for a limited time!

Stage: Hard Rain

Participation conditions: Your class must be A5 or more.