- Activate on Steam
2K Strategy Pack
3 Game Downloads in This Bundle
1. Sid Meier's Civilization V: Game of the Year Edition
2. Sid Meier's Civilization IV: The Complete Edition
3. The Stronghold Collection
According to user reviews the purchase provides a Steam activation code, both the Civ games on Steam offer play on both Mac OS and Windows, though Stronghold looks like it is Windows only.