Papers, Please is one unique snowflake in the massive ammount of Indie Games that is turning up lately on Steam. If you get to pick one Indie game to play, make it this one.
While playing it you will not only be confronted with moral dilemmas and unexpected inspections, you might also be encouraged to think about oppressive regimes and what they mean for the people that have to live in them. Bonus points to you if you start pondering about what a state should do for its citizens and what not.
And even if you are unable to grasp the deeper facettes of this game, you will have still a great time stamping "Denied" or "Approved" into Visa markings.
The game gets more and more complex the longer you play it. Discovering all the endings and unlocking Achievements also add to the fun. I also enjoyed the music in this game, its suprisingly nice.
You should plan your next holiday in Arstotzka, make sure you get your Papers in time.
Glory to Arstotzka!