As you progress, you can develop Nuclear Weapons . These are expensive but can instantly weaken a massive superpower that you otherwise couldn't beat [1]. 💰 Economy is Key
The game is available for on the Google Play Store and Apple App Store, though it contains optional in-game purchases and ads [1, 2].
The "loop" of the game is: Earn Gold -> Upgrade Production -> Upgrade Military -> Conquer -> Repeat. If you stop upgrading production, your expansion will eventually stall [3].
Choose a country with decent initial gold production. Many players find starting in Europe or North America easier due to the concentration of wealthy neighbors.