Survival Defense:Zombie app analytics for January 16

Progress permanently between battles through upgrades and progression systems. Strengthen your heroes and defenses outside the battlefield, then rely on luck, skills, and smart choices inside every run. Progress never stops. Upgrade permanently between battles to grow stronger, unlock new power, and prepare for harder challenges. Once the fight begins, every run is different—random upgrades, unpredictable encounters, and risky decisions shape your survival. Balance long-term progression with moment-to-moment luck. Build your strategy, adapt on the fly, and see how long you can survive against endless enemy waves.