Boom Beach Mega Crab STAGE 21 First Attempt(붐비치 메가크랩 스테이지21 첫번째공략)

Boom Beach Mega Crab STAGE 21 First Attempt(붐비치 메가크랩 스테이지21 첫번째공략) do not know why but it is clear that 21 is much easier than 20.