Games like Planet Nine
Games like Planet Nine include Fallout 4, Crimson Desert Enhanced, STAR WARS Jedi: Survivor™, Fallout: New Vegas, and Hogwarts Legacy. We matched them by the tags players give Planet Nine on Steam (Shooter, Combat, Action, Sci-fi, and Exploration): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Exploration · Shooter · Open World

Crimson Desert Enhanced
Shared: Action · Combat · Exploration

STAR WARS Jedi: Survivor™
Shared: Action · Sci-fi · Open World

Fallout: New Vegas
Shared: Open World · Exploration · Action

Hogwarts Legacy
Shared: Open World · Exploration · Character Customization

ARMORED CORE™ VI FIRES OF RUBICON™
Shared: Action · Combat · Character Customization

Starfield
Shared: Sci-fi · Exploration · Open World

Avatar: Frontiers of Pandora™
Shared: Action · Shooter · Open World

Titanfall® 2
Shared: Shooter · Action · Sci-fi

Fallout 3
Shared: Exploration · Open World · Sci-fi

God of War
Shared: Action · Combat · Singleplayer

BioShock Infinite
Shared: Shooter · Action · Singleplayer

Grand Theft Auto V Legacy
Shared: Action · Shooter · Open World

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Shooter · Open World · Exploration

Marvel’s Spider-Man Remastered
Shared: Action · Combat · Open World

Cyberpunk 2077
Shared: Open World · Sci-fi · Singleplayer

Monster Hunter: World
Shared: Action · Character Customization · Open World

STAR WARS™ Battlefront™ II
Shared: Shooter · Sci-fi · Action

Just Cause™ 3
Shared: Action · Shooter · Open World

Half-Life 2
Shared: Action · Sci-fi · Shooter

Marvel’s Spider-Man: Miles Morales
Shared: Action · Combat · Open World

Star Wars Outlaws
Shared: Action · Shooter · Open World

The Outer Worlds 2
Shared: Exploration · Sci-fi · Singleplayer

Wuthering Waves
Shared: Action · Combat · Open World