Civilization VI may not be one of the cheaper games available on the App Store, but publisher Aspyr is helping to take the edge off a bit this holiday season, offering up all of the game’s expansion packs for free on iOS.

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The sale will cycle through each expansion every 48 hours, so be sure to grab the expansions within that window if you want them for free. Once time is up, they’ll return to their full price tag. However, once you download an expansion, it’s yours to keep forever, making this a pretty incredible sale. Here’s the release schedule:

12/20 - 12/22: Poland Civilization & Scenario Pack
12/22 - 12/24: Vikings Scenario
12/24 - 12/26: Australia Civilization & Scenario Pack
12/26 - 12/28: Persia and Macedon Civilization & Scenario Pack
12/28 - 12/30: Nubia Civilization & Scenario Pack
12/30 - 1/1: Khmer and Indonesia Civilization & Scenario Pack
It’s worth noting that the Civilization VI base game is required for each expansion pack. However, Civilization VI itself is currently on sale for 75% off if you haven’t snagged it already.