Planet Nine

🪐 Merge planets and unravel the mystery of the universe!

It's out there somewhere, yet no one has ever found it——the "ninth planet". Collide cute planets together, merge them, and uncover the secret yourself.

🌟 Aim, shoot, merge

Launch a planet like a billiard ball and send it crashing into another of the same kind — they'll merge into one! Grow from tiny Mercury toward the larger planets, one merge at a time. 3-5 minutes per run, played with just a mouse. Perfect for a quick break, and easy to come back to again and again.

🚀 Features

A cast of original, adorable planet characters

A unique physics-based merge system — think billiards, but in space

Merging planets can send others flying your way — deflect them before they cross the line!

A cozy, relaxing space world to get lost in

Playable in 17 languages, including English and Japanese

🏆 Regional and global leaderboards

Your high scores go to both your country's leaderboard and the global one, ranked across daily, monthly, and all-time boards. How far can you climb? And what will you find when you finally reach the ninth planet...?

🎁 Collect as you play

Spend the coins you earn to unlock music, themes and illustrations. The more you collect, the more your own version of the universe changes.

🎵 Music from seventeen creators

The music features six guest composers (neruko / Sentaku / asMi / ꄲꅐ꒒ / Kadan / NemCa) alongside eleven more musicians selected through an open call.

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Streaming, Let's Plays, and video uploads are welcome. No permission needed, no reporting required.

Monetization through a platform's official features is fine, and the music and sound effects that play during gameplay may stay in the recording.

Full details are on the official site under "Video & Streaming Guidelines".

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