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Games where you have to manage resources in order to complete objectives. 

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

Games which have short playtimes and can usually be completed in one sitting.

Focused on using its text, moreso than its visuals or audio, to tell the bulk of its story/plot. (Still can have great audio and visuals, though!)

Resources for building and relating to User Interfaces, how the user interacts with your program