What's a fun iOS game that involves strategic territory expansion?

State.io is a great choice for anyone looking for a quick and engaging strategy game on iOS. The core gameplay revolves around expanding your territory by strategically attacking and capturing adjacent states. You increase your numbers, plan your attacks, and watch as your color spreads across the map. It's simple to understand, making it easy to pick up and play, but it also offers a surprising amount of strategic depth as you progress through the levels. Players find it "relaxing and [requiring you] to make a plan for the whole thing." While some users mention excessive ads, the core gameplay loop is undeniably addictive and satisfying. The game is also praised for being challenging and playful. However, some users have noted that the PvP mode uses bots instead of real players.