Planet Nine
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About Planet Nine
Planet Nine is a physics-based planet-merging game about searching for the undiscovered ninth planet. You launch planets into one another like billiard balls; when two of the same kind collide, they merge. Starting with tiny Mercury, you work toward larger planets and uncover the universe's secret.
Aim and merge
Each run takes 3–5 minutes. Merging planets can send other planets flying toward you, so you deflect them before they cross the line. The game features original planet characters and a space world.
Scores and collections
Your high scores appear on country and global leaderboards, with daily, monthly and all-time rankings. Coins earned during play unlock music, themes and illustrations, changing your version of the universe as you collect them.
Music
The soundtrack features six guest composers—neruko, Sentaku, asMi, ꄲꅐ꒒, Kadan and NemCa—and eleven more musicians selected through an open call.
Frequently asked questions
The best price for Planet Nine is $1.77 at GameBoost. That is 74% less than on Steam, where it costs $6.99. 4 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
Every key we list activates on Steam. Redeem the key there and Planet Nine stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for Planet Nine are: Windows 10, Intel Core i5, 4 GB RAM, 400 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.
No. Planet Nine is a single-player game.
Yes. Planet Nine is the full base game. You need nothing else to play it.
Buy Planet Nine 74% cheaper than on Steam.
Planet Nine is available for 74% less in shops such as GameBoost, Gameseal, or GamersGate.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.
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