civilization-5
I've downloaded and reinstalled the Steam version of Civilization (version 1.0.1.511 on Windows 7) along with all of its DLCs: everything is marked as "Installed" and the custom maps are all there and working. The game runs fine as well.
However, neither the main menu nor any of the sub-menus have the "Scenarios" menu. I've searched everywhere with no luck, and I have no way of accessing any of the DLC content.
How can I fix this?
There is a mod called Info Addict that shows graphs:
Unless you start conquering quickly, you won't be able to conquer enough civilizations in time. My tactic (in difficulty level 5 if I remember correctly) was to immediately use my horseman to conquer the nearby city-state (to the south east) and then the Siamese civilization. It's not an easy war to wage but conquering these cities is a pretty fast way to expand your borders quickly.
Use the terrain to your advantage, as well as the powerful Khan generals and the ranged knights. Avoid fighting in hills until you can get a few pikemen.
I continued to conquer and advance to the south east until I couldn't (that's Siam + China), and then turned my attention west and attacked India and Persia, ending the game on time.
My biggest problem throughout this playthrough was maintaining happiness. Try to prioritize conquering cities with resources and burn down cities that don't really help. The bonuses from city-states are also very nice, so it's recommended you take them as soon as you can afford to.
Best Answer
Have you tried verifying integrity?
Verify integrity of game cache