Strategy Focus: Invest Wisely!

Fortress Merge: Puzzle Defense is a puzzle defense game where you merge units of the same type to create stronger forces and defend against waves of enemies. In the early stages, rather than deploying a large number of units indiscriminately, it's crucial to **quickly merge identical units to create higher-tier ones**. When a battle begins, first identify the enemy's approach direction and key attack points, then deploy powerful units where firepower is needed. Instead of keeping multiple low-tier units, it's more efficient to increase their combat power by merging them to raise their tier. If you're stuck on a stage, it's better to focus on merging and upgrading existing units rather than randomly increasing the number of new units. Specifically, instead of evenly upgrading various units a little bit, **designating a main unit to focus your investments on** will aid your growth. Furthermore, utilize the resources and rewards obtained from battles immediately for growth, and consistently collect event and free rewards. Basically, it's about **unit deployment → merge identical units → upgrade main units → sta