If you have yet to try one of the best turn-based empire-building games in recent times, then you’re in luck: you can play Civilization V on Steam for free until October 23.

As described on the Steam page of Civilization V:

“Become Ruler of the World by establishing and leading a civilization from the dawn of man into the space age: Wage war, conduct diplomacy, discover new technologies, go head-to-head with some of history’s greatest leaders and build the most powerful empire the world has ever known.”

Publisher 2K Games is running the promo for the impending release of Civilization: Beyond Earth, which can be pre-downloaded and ready for play the moment the game officially launches on October 23.

Here’s Beyond Earth’s description on Steam:

“Explore and colonize an alien planet, research new technologies, amass mighty armies, build incredible Wonders and shape the face of your new world. As you embark on your journey you must make critical decisions. From your choice of sponsor and the make-up of your colony, to the ultimate path you choose for your civilization, every decision opens up new possibilities.”

Civilization: Beyond Earth brings quite a few notable additions to the franchise, from Affinities that drastically alter the direction of your faction to a major overhaul of Civilization’s research paths.