If you are a fan of real-time strategy games, then you should head to Steam and grab a copy of Sins of a Solar Empire: Rebellion for free, between now and December 19. This is a great offer, considering the game's original price is $40.
Sins of a Solar Empire: Rebellion is the standalone expansion of the original Sins of a Solar Empire, which was launched in 2012. There are three different races that players can control in the game: the industrial TEC, the psychic Advent, or the alien Vasari. The playing field is a 3D web of planets and other celestial objects in the orbital plane of one or more stars. The game features a sandbox mode, allowing the player to choose different types of solar systems to unlock achievements. Players can conquer neighboring planets and explore distant star systems in a "massively scaled, fully 3D environment featuring entire galaxies, orbiting planets, clusters of asteroids, space dust, and radiant stars." Notably, there is no single-player campaign mode, but games can be played against AI opponents offline and other players online.
The game has received a lot of critical acclaims from both gamers and critic alike. One review site even gives the game nice praise like this:
"Rebellion puts a nice capper on the Sins of a Solar Empire franchise. While this is an excellent game, with loads of new options and an incredible amount of tactical depth, it does show the age of the series. It's hard to imagine the Sins games progressing without a more serious overhaul to move the next release into full-blown sequel territory. Until that game launches, however, you can get your space-empire fix from this excellent stand-alone expansion, which contains enough ways to conquer a galaxy to tide you over for a very long time."
The reason for the giveaway is the release of the DLC expansion Minor Factions, which adds 15 more minor factions to the game, each of which has unique abilities and advantages. With these enabled, publisher Stardock Entertainment says, the "game will place some minor factions onto the map to expand your strategic and tactical options."