Discount site StackSocial is offering Polygon readers an extra discount on the already marked down Civilization 6: Gold Edition, as well as the Gathering Storm DLC and the game’s previous iteration, Civilization 5: Complete.

Use the coupon code POLYGON10 at checkout to take 10% off sale prices on those three Civ titles.

Usually $99.99, Civilization 6: Gold Edition includes six new civilization and scenario DLC packs to add to the base game: “Vikings,” “Poland,” “Australia,” “Persia and Macedon,” “Nubia,” and “Khmer and Indonesia.” It also comes with the excellent Rise and Fall expansion, which steers players away from military conquest into more creative means of consolidating power. StackSocial (and a few other discount sites) are offering the game for $24.99, but our discount code brings it down to $22.49, the lowest price we’ve seen on the Gold Edition.

StackSocial is also offering a discount on the Gathering Storm DLC for Civilization 6, which launched earlier this year. Our reviewer thought that the $39.99 price tag (since dropped to $29.99) was too steep for what the global warming-inspired expansion offered. This exclusive discount brings it down to a much more reasonable $17.99.

Finally, the Civilization 5 Complete bundle, which includes all DLC associated with Civ’s fifth edition, is down to $11.25 with our code (usually $59.99.)

Our exclusive discount code, POLYGON10, is valid at StackSocial through the end of September.