ProtoCradle

Cosmic Sandbox: Build New Worlds

ProtoCradle is a real-time cosmic sandbox simulation where you create and evolve a living planet from a primitive asteroid. Explore the journey of a world through 11 spectacular celestial transformations, powered by dynamic physics and creative experimentation.

Forge Your World

Shape your planet by introducing different types of cosmic matter:

• Gas Meteors expand the atmosphere and influence planetary growth • Molten Meteors increase surface temperature and volcanic activity • Ice Comets cool the planet and form frozen environments • Iron Asteroids build a dense planetary core • Cosmic Energy Objects create powerful celestial reactions

Every interaction is driven by simulated physics, with mass, temperature, composition, and gravity working together to create unique planetary outcomes.

Unlock 11 Celestial Stages

Watch your creation transform through different cosmic forms:

→ Proto-Core Asteroid → Rocky Planet → Ocean World → Volcanic Planet → Frozen Ice World → Gas Giant → Ice Giant → Hot Jupiter → Radiant Star → Stellar Evolution Stage → Cosmic Singularity

Explore Cosmic Challenges

Complete six handcrafted scenarios that test your understanding of planetary evolution — from creating habitable worlds to exploring advanced stellar phenomena. Discover new knowledge through the in-game Codex.

Creative Sandbox Tools

• Sculpt planetary surfaces with precision tools • Adjust gravity and experiment with planetary physics • Customize world properties with detailed sliders • Save and revisit your favorite creations • Create meteor streams or individual cosmic events • Observe dramatic stellar transformations through simulation

No limits. No timers. Just creativity, exploration, and the wonders of the universe.