To remove or shelve. For various reasons, some games may be deleted or removed from the Steam platform, such as the closure of game production companies and copyright issues. In this case, even if the game has been purchased before, it may be impossible to download and install it again because the game has been deleted or removed. In addition, if a game is only sold in a specific region, users in other regions will not be able to find and download the game, mainly because some game publishers have independent licensing agreements, which stipulate the game. Some games in Steam are hidden, that is, they are not directly displayed in the Steam store and need to be accessed and viewed through search or specific links. Generally speaking, these hidden games may be games that have not been officially released, have been removed from the shelves or are only sold in specific areas.