Papers, Please starts with very simple mechanics and becomes more complex as you go through the story. Part of the complexity is deciding whether to help out the people who visit you. Your "job" and "salary" depend on following the protocol, but underneath the mechanics is a story about Arstotzka and the surrounding countries that people travel from.

Overall, a fun game if you explore the details. Your choices affect the outcome of every playthrough and decide the fate of the country as well.