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Games that don't have vilolence as a primary component.

A subgenre of the adventure game, point-and-click games typically involve interacting with background objects, talking to non-player characters, and using an item inventory to solve puzzles that allow the player to progress through the story.

Taking place after a huge catastrophe (eg. man made or natural disaster). See also the more political theme dystopian.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

Games that can be played alone