The short answer
Usually, after a check. Might hold something you care about. Look inside before removing it.
What is it?
Each folder in steamapps/common is an installed Steam game with all its assets. Sizes range from under 1 GB to well over 100 GB per game.
Installed games. Steam Cloud keeps most saves; games can be downloaded again or moved to another library folder.
What happens if you delete it?
Uninstalled games can be downloaded again from your Steam library. Steam Cloud keeps saves for most games, but some store saves only locally, sometimes inside the game folder.
How to remove it properly
In Steam, open Library, right-click the game and choose Manage › Uninstall. To keep a game but free internal space, add a library folder on another drive in Steam › Settings › Storage, then use Manage › Move install folder.
From the app itself: Steam > Library: right-click the game > Manage > Uninstall (or Move install folder).
Before you delete it
Back up mods and local saves first: uninstalling removes the whole game folder.
How MoreRoom helps
MoreRoom recognises this item and labels it “Review first”: it shows what’s inside, its size and last use, so you can decide. Nothing is removed without your say, and everything goes to the Trash first, with Undo.
Frequently asked questions
Is it safe to delete Steam games in steamapps/common?
Usually, after a check. Might hold something you care about. Look inside before removing it. Uninstalled games can be downloaded again from your Steam library. Steam Cloud keeps saves for most games, but some store saves only locally, sometimes inside the game folder.
Will Steam games come back after I delete it?
Yes. Uninstalled games can be downloaded again from your Steam library. Steam Cloud keeps saves for most games, but some store saves only locally, sometimes inside the game folder.
How do I remove Steam games properly?
In Steam, open Library, right-click the game and choose Manage › Uninstall. To keep a game but free internal space, add a library folder on another drive in Steam › Settings › Storage, then use Manage › Move install folder.