What's a fun iOS game for merging and defending a fortress against zombies?

Fortress Merge offers a unique blend of merging and tower defense, making it a fun and engaging experience on iOS. You'll start with basic structures and gradually merge them to create more powerful defenses. As you progress, you'll encounter increasingly challenging waves of zombies, requiring you to strategically place and upgrade your towers. The game features different worlds, each with its own unique environments and zombie types. While some players have noted a difficulty spike in later levels, the core gameplay loop of merging and defending remains addictive. The ability to develop your board and create a powerful fortress is a key element of the game's appeal, keeping you invested in upgrading and optimizing your defenses. If you enjoy strategy and puzzle elements, Fortress Merge provides a compelling experience.