Metro 2033 Redux for PC & Mac (Steam) for Free

In 2013 the world was devastated by an apocalyptic event, annihilating almost all mankind and turning the Earth's surface into a poisonous wasteland. A handful of survivors took refuge in the depths of the Moscow underground, and human civilization entered a new Dark Age. The year is 2033.
Single-player
Steam Achievements
Steam Trading Cards
Steam Cloud
Family Sharing