Gratuitous Space Battles has received quite a bit of acclaim since its release for offering up a strategy-heavy game for sci-fi fans and now has its greatest sale yet for Steam users. From now until Feb. 24, the game is free to play, and if you take part in that and find that you love it, you'll have until Feb. 25 to purchase it at 75% for $3.74, or you can pick up the Complete Pack with a ton of DLC for a mere dollar more. After that, the prices go back to normal -- the base game will cost $15 and the Complete Pack will set you back $20.