A separate procedurally-generated 'endless' mode is unlocked after reaching a certain ending in story mode. The amount of money earned has an influence on several of the endings.

Endings are based on the decisions you make each day.8 of the endings are attained by completing the entire game in different ways. Retrying days or getting multiple endings takes longer. The game is divided into days and there are 31 days in all.

Using only the documents provided by travelers and the Ministry of Admission's primitive inspect, search, and fingerprint systems you must decide who can enter Arstotzka and who will be turned away or arrested. Among the throngs of immigrants and visitors looking for work are hidden smugglers, spies, and terrorists. Your job as immigration inspector is to control the flow of people entering the Arstotzkan side of Grestin from Kolechia. The communist state of Arstotzka has ended a 6-year war with neighboring Kolechia and reclaimed its rightful half of the border town, Grestin.