In free indie game Presentable Liberty, you take on the role of a prisoner in a locked cell. No one seems to be around, and your only contact with the outside world is a serious of letters pushed under your door by various characters. It isn't clear what's going on at first, but gradually the picture of what's going on becomes clear and your character will be faced by some difficult choices. In the meantime, you'll have to amuse yourself in your cell.
All alone for the end of the world
Presentable Liberty, at least initially, is very linear -- letters arrive and you read them without really making any decision. You can amuse yourself by playing a variety of in-game minigames, but the result is unimportant: the games are just a way to pass the time in your cell, which may be a scathing critique of the games industry in general. By the end of the game, however, you'll be forced to make some simple but heavy choices.
Spend some time in jail
Presentable Liberty is a strange, slightly depressing narrative experience with minimal (but important) gameplay elements. It isn't very long, and it's free, so if you're interested in seeing an unusual and compelling psychological horror narrative in game form, you should definitely give it a try.