Macao is a special administrative region of China, which has the status of special jurisdiction for business and gambling. This is a city located on the coast of the South China Sea. Previously it was a Portuguese colony. Based on Wikipedia (1), it has a 32,9 km2 area and a population of about 680,000 people.
Mainly, Macao is popular as a place for gambling tourism and by some assumptions (2) its gambling industry is 7 times larger than Las Vegas.
Based on Local Immigration Office Website (3) citizens of 81 countries can stay in Macao without a visa from 30 to 90 days including CIS countries, EU, Asia, and Latin America. According to Visadb (4) it’s possible to get a residence permit in Macau for foreign investors, after 110 months of living they can get a permanent residency. Based on Wikipedia (5) there is also an option to get residence permit in Macao by investment in fixed assets such as real estate (more than 1,000,000 MOP or about $128,000) or bank deposit (500,000 MOP or $69,000).
Another options to live in Macao include student visa, non skilled working visa and talent visa according to Visit World (6).