Gravity Courier

Read the planets. Time the launch. Let gravity do the rest.

Gravity Courier is a minimalist space puzzle built on real orbital mechanics. You are a deep-space delivery controller: you don't fly the ship — you choose the launch date, direction, and thrust, then watch physics take over. One decision, one launch, one elegant orbit.

The whole solar system is alive. Planets and moons orbit in real time, the Sun pulls on everything, and your probe follows true n-body gravity. To hit a moving target you have to think ahead — lead your shot, borrow a planet's pull, and slip into the target's orbit at just the right moment.

HOW TO PLAY • Pick a launch day with the slider — the planets keep moving. • Pull back like a slingshot to set direction and thrust. • See the predicted trajectory and target marker update live. • Hit Launch and watch the simulation play out. • Earn up to 3 stars for arriving, saving fuel, and arriving fast.

FEATURES • Real orbital physics — gravity, transfer orbits, and timing that actually matter. • Pure one-shot puzzle — no twitch reflexes, no endless tapping. • Slingshot aiming with a live trajectory preview. • Dozens of missions: enter orbit, fly by and return, land softly, reach distant worlds. • A full solar system — the Moon, Venus, Mars, Jupiter, Saturn and beyond. • Micro-boost: pre-plan a mid-flight burn to thread tricky orbits. • Gravity assists — use a planet's pull to reach what thrust alone can't. • Clean, calm sci-fi visuals and a quiet starfield soundtrack.

Easy to launch in 5 seconds. Hard to launch perfectly.

Think like a flight director. Conquer the solar system, one orbit at a time.

Recent changes:
Learn how to break free of Earth! 🚀
- Improved Venus tutorial: launch at full power, then boost right after launch to escape Earth.
- Venus and Mars mission briefings now include Earth-escape tips.
- If you can't escape Earth and hit the Moon, we now tell you why and how to fix it.
- Relaxed the fuel limit on the Venus fuel-saving mission.