Single-player games like Planet Nine
Below are 8 single-player Steam games similar to Planet Nine, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Planet Nine page.
Ranked picks
- 1
重装无限·Metal Infinite
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
或许在某个时空里他已经战败了 但是在这里或许可以改写一切，传说最强的赏金猎人！ 那段未完的故事 将如何开始又如何结束...
- 2
Run and Gun
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and RPG with Planet Nine.
Run and Gun is an action roguelike shooting game where you mow down thousands of enemies while unlocking newer and deadlier weapons. The enemies won't stop spawning, and your guns won't stop firing. Earn gold each run to unlock permanent upgrades to make your next run deadlier.
- 3
Planet Miners
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
Control a mining robot and dig for mineral resources on various planets. Transport the valuable ores with your spaceship. Buy or craft upgrades to improve your tools. Defend yourself against the dangers of each planet to mine even the most valuable treasures!
- 4
Callsign: Stargazer
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
Pilot and customise your mech for the mercenary group Laplace as you take on contracts from different factions in this 2D mecha Action-RPG.
- 5
MOBILE SUIT GUNDAM SEED BATTLE DESTINY REMASTERED
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and RPG with Planet Nine.
Become a pilot in the world of Mobile Suit Gundam SEED, for the first time available with English localization! Engage in thrilling, action-packed Gundam battles, complete missions, and tune up your newly acquired Mobile Suits!
- 6
M.A.S.S. Builder
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
Commander, customize and build your Mechanical Assault Skeleton Suit (M.A.S.S.) and lead the fight against an alien invasion bent on exterminating the human race. The fate of humanity is in your hands.
- 7
ARMED SEVEN
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
The year is 1989. 12 years have passed since the Gogoh Army’s invasion of Earth. Exposure to alien technology during the war enabled Earth’s own technologies to take massive leaps forward. International conflict that was previously rife in the history of mankind fell to an all-time low, and the Earth Federation was established as a...
- 8
Astebreed: Definitive Edition
Single-player alternative to Planet Nine — playable solo, no multiplayer required. Shares Action and Indie with Planet Nine.
Climb into the cockpit of an otherworldly war machine and fly into battle against a horrifying alien race bent on eradicating humanity to preserve their own civilization.