Papers, Please is a critically acclaimed border inspection simulator set in the fictional, Cold War–inspired nation of Arstotzka. As an immigration inspector, you process arriving travelers — checking passports, work permits, entry visas, and other documents — while deciding who gets in, who gets detained, and who is turned away.
If you're looking for an "unblocked" version of the game, it's likely because you're trying to access it from a restricted environment, such as a school or workplace, where gaming sites might be blocked.