Action
Casual
Defense
Merge
Puzzle
Strategy
UnderwaterHow to Play Hydra Merge Defense
Pick up rocks by clicking or touching them, then place them in your warehouse area to stack. Merge identical rocks to upgrade them into higher-level rocks, which release energy fragments. Collect energy to summon the mighty Hydra, which will clear large sections of rocks. Avoid the red warning line—if your stack reaches it, the game ends. As you progress, rock spawn speed and rock levels increase, challenging your reflexes and strategy. Controls Desktop: Mouse Click: Pick up rocks Click again in the warehouse area to place the rocks Mobile: Touch and Drag: Pick up rocks and drag them to the warehouse area Tap on the energy bar to summon the Hydra Key Features Innovative rock-merging gameplay with strategic stacking Mighty Hydra summon to clear large areas of rocks Increasing difficulty with faster rock spawns and higher-level rocks Beautiful underwater theme with smooth animations Simple controls that make the game accessible on both desktop and mobile High replay value with endless levels and increasing challenges
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