Island Defense: Merge TD

Merge heroes to defend waves, pick 1 of 3 upgrades—max level unlocks skills!

Monsters are invading—build your squad, hold the line, and clear the stage!
This game combines wave defense, hero merging, and roguelike 3-choice upgrades. Recruit heroes with gold, merge them into stronger versions, and shape every run with different upgrade paths.
Wave Defense Battles
Survive wave after wave of enemies. Strategy matters: lineup choices, positioning, and timing can decide everything.
Recruit and Merge Heroes
Earn gold after each wave and bring new heroes onto the battlefield.
Merge heroes with the same star level and type to upgrade them.
Max out a hero at Level 4 to unlock a unique signature skill—a key part of your build.
Roguelike 3-Choice Upgrades (In-Run)
Defeat enemies to gain EXP during the fight. When you level up, you get a choose 1 of 3 upgrade decision. Every run becomes a new build puzzle with fresh synergies.
Permanent Progression (Outside of Battle)
Your power keeps growing beyond a single run.
You can permanently upgrade heroes, strengthen your Captain, and buy/upgrade/equip gear for long-term stats and progression.
Each run, you choose one Captain to deploy, providing global team buffs and defining your playstyle.
Choose your Captain, craft your build, and push as far as you can.
How many waves can you survive?