Man, lots of free stuff for us PC gamers today. Earlier today, we informed you about the prototype versions of Mortal Kombat HD that are available for download, as well as the free giveaway for Anno 1602. And it appears that Stardock is also offering free copies of Sins of a Solar Empire: Rebellion on Steam for the next 48 hours.

Rebellion is a stand-alone expansion for Sins of a Solar Empire that combines 4X depth with real-time strategy gameplay. The game came out in 2012 and has Very Positive Reviews on Steam.

Those interested can acquire their free copies from here, and below you can find the game’s key features.

New Factions : Decide whether to play as a Loyalist or Rebel – each unlocks new technologies, ships and play styles for each race.

: Decide whether to play as a Loyalist or Rebel – each unlocks new technologies, ships and play styles for each race. New Titan Class Warships : Mighty titans enter the fray of the war to tip the scales of power. Each faction may field their own unique titan, drawing upon unique strengths and abilities on the battlefield.

: Mighty titans enter the fray of the war to tip the scales of power. Each faction may field their own unique titan, drawing upon unique strengths and abilities on the battlefield. New and Updated Capital Ships : A new capital ship joins the fleet for each race to offer even more tactical options. Additionally, all existing capital ships have been upgraded to four levels for their abilities, allowing players to focus their ships along specific strengths.

: A new capital ship joins the fleet for each race to offer even more tactical options. Additionally, all existing capital ships have been upgraded to four levels for their abilities, allowing players to focus their ships along specific strengths. New Corvette Class Ships : Small and maneuverable, each faction has developed a new light attack craft to harass enemy forces.

: Small and maneuverable, each faction has developed a new light attack craft to harass enemy forces. Updated Visuals : Updated graphics, particle effects, lighting and shadows, race specific UI and other enhancements make the Sins’ universe look better than ever.

: Updated graphics, particle effects, lighting and shadows, race specific UI and other enhancements make the Sins’ universe look better than ever. New Victory Conditions : Take multiple paths to victory including – Military, Diplomatic, Research, Last Flagship Standing, Last Capital Standing and Occupation.

: Take multiple paths to victory including – Military, Diplomatic, Research, Last Flagship Standing, Last Capital Standing and Occupation. New Audio : More than 60 minutes of original music, countless new sound effects and dozens of new voice overs help bring the drama of battle to new levels of immersion.

: More than 60 minutes of original music, countless new sound effects and dozens of new voice overs help bring the drama of battle to new levels of immersion. Tutorials : New and updated tutorials make it easy for both experienced and new players to quickly start building their own solar empire.

: New and updated tutorials make it easy for both experienced and new players to quickly start building their own solar empire. Plus, a number of optimizations that provide better performance than ever before