Play Planet Builder online for free — a satisfying idle clicker simulation where you shape a planet from cosmic dust into a thriving world! Start by gathering basic resources, then watch your planet evolve as you unlock atmosphere, oceans, life, and civilizations. This free browser idle game features auto-generators for passive income, strategic upgrades, and an engaging prestige system (Big Bang!) that lets you reset with permanent bonuses for faster progress. Your progress saves automatically via localStorage. No download needed — start building your planet instantly on any device.

• Click the planet to gather resources and earn currency
• Purchase upgrades to boost your production rate
• Unlock new planetary stages as you progress
• Use auto-generators to earn resources even while idle
• Trigger Big Bang (Prestige) to reset with permanent bonuses
• Save your progress and come back to keep building!