Mr.Hytem, you need a visa to enter Macau, you can get the visa on arrival if you have valid visa to renenter China. My meaning is that if you hold a double or multiple entry visa F visa which permits you enter China again aftering visiting Macau, then you can get the Macau visa on arrival because the China F visa can prove that your next destination is Mainland China, otherwise, you can't get a Macau visa on arrival.