For those who don’t already know this, Hong Kong Police has invoked the city’s national security law to ban “Reversed Front: Bonfire” (逆統戰：烽火), a mobile game developed by ESC Taiwan. Anyone who downloads / shares / recommends the app or makes payments / offers financial assistance to the app developer would be arrested and punished for engaging in acts or activities endangering national security (info.gov.hk/gia/general/20). 
Players of Reversed Front: Bonfire can reportedly "pledge allegiance" to Taiwan, Hong Kong, Mongolia, Tibet or Uyghurs, among other options, and "overthrow the Communist regime".
The game also allows for users to play as communists to fight enemies and support the communist revolution.
bbc.com/news/articles/