Sector Ninja is a stealth action game where you play as a ninja assassin moving through enemy controlled sectors with only a katana. To advance, you must clear every sector by eliminating all hostile ninjas across 2-3 stages. Enemies patrol with blades and weapons, and once they spot you, survival becomes much harder. Stay out of sight, approach carefully, and strike first with silent takedowns. Defeated enemies drop money that can be used to unlock new skins. As you progress, sectors become harder and require better timing and stealth.