Battle Islands is a free-to-play real-time strategy game with pacific warfare setting during World War II. The basic gameplay is similar to real-time strategy games as you can build structures such as factories, barracks, shipyards, and such, and produce various ground, aerial and naval units. You earn experience and medals through battles and victories, which in turn let you build new and more powerful units and structures. Players can purchase the in-game gold currency with real money which gives an edge in battles by being able to quickly purchase more powerful and useful items in the tech tree. As the title implies, the battles are waged on the islands, whether on your own island where you have to defend it against enemy AI or against a player, or when you are attacking and trying to overtake an enemy occupied island. Islands can also be expanded by building additional land mass connecting it with bridges, which gives you place for more structures.