There's a game that I really want to play. I'll be getting it soon, even though it's pretty old. It's called Pathologic. It was developed by Russian studio Ice-Pick Lodge and released for PC back in 2005 or 2006. I don't even know how to appropriately describe this game. It introduces a quite deep moral choice system that can change many things. Most games that have a moral choice system (Fable, Bioshock, inFAMOUS, etc.) either place you at one extreme or another. You either become a shining savior and saint, or else a wicked mustache-twirling villainous combination of Hitler and Satan. Pathologic goes far beyond that.
You see, there's a town that has succumb to a spreading illness. You pick one of the three (vastly different) characters and play through the game from their viewpoint. You are sick as well, and you have to try to find a way to stop this illness before everyone is gone. You have 12 in-game days to do so. You have to keep your character alive, by getting medicines and eating food as a real person would have to. And there is where the moral choices come in.
Do you kill that child in the dark alley and steal the medicine or items on him to survive a bit longer yourself?
Do you give some of your very limited pain medications to a suffering man begging at your feet, or ignore him and horde it all for yourself?
You just got a gun and six bullets, you're starving though. Will you trade the gun for some food?
Moreover, how will your decisions affect things?
If anyone is curious or the least bit interested, I highly suggest reading
this three-part article about the game. Part 3 does contain ending spoilers though, so be warned.