Experts, help: from Singapore to Macao, and then back to Singapore.

The usual way to go to Macau with a China passport is to pass through Macau. There is no need to apply for a Macao visa in Singapore. As long as you stay in Macau for three days, you can leave Macau with a China passport and enter Zhuhai Gongbei Port for a certain period of time, then leave the country immediately from the exit hall of Gongbei Port and then enter Macau to close the gate. In this way, you don't need a Macao visa or a Hong Kong and Macao pass, so you can calculate the transit through Macao. Remember, when you leave Gongbei Port, you should prepare your e-ticket from Macau Airport to Singapore for China border inspection. If there are no relatives and friends in Shenzhen, there is no need to spend more money in Shenzhen.