CORE: Idle Tower Defense is a free-to-play strategy game on Android that offers a unique blend of idle gameplay and tower defense mechanics. Players manage a central Core that automatically fires at incoming enemies while making strategic decisions to upgrade their defenses. The game allows players to spend Credits earned from defeating foes on various upgrades like Damage, Fire Rate, and Range, ensuring that every moment in battle is filled with tactical choices.

The game introduces a variety of Perks that can be chosen every ten waves, enhancing gameplay with powerful abilities such as extra projectiles and chain lightning. Players can also experience permanent progression through the Workshop and Research systems, which strengthen their towers for future runs. With a variety of enemy types, escalating Sectors, and boss battles, CORE provides endless opportunities for strategic play and optimization.