What's a good Android app for a quick, strategic conquest game that's easy to learn but still makes you think?

State.io — Conquer the World is a streamlined territory conquest game that excels at delivering strategic gameplay in short sessions. The core loop involves tapping states to allocate troops, capturing adjacent territories, and gradually overwhelming opponents on a map of the USA or other regions. Its strength lies in presenting a straightforward rule set—allocate troops, attack, reinforce—that quickly reveals deeper tactical considerations, such as managing front lines and timing large offensives. This makes it suitable for brief play sessions during a commute or break, where a full match can be completed in just a few minutes.

However, the game's accessibility comes with a trade-off in long-term challenge for some players. Reviews indicate that while the initial learning curve and PvP leaderboards provide engagement, the player-versus-environment mode can become predictable, with AI opponents sometimes lacking aggressive counter-play. The recent adjustments to the ad system have been positively received, reducing intrusive interruptions. For anyone seeking a light strategy fix without complex resource management or lengthy tutorials, State.io offers a satisfying package, though veterans of the genre might find the strategic ceiling lower than in more intricate war games.