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

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.

A type of game where the player builds defensive structures to stop waves of enemies from reaching and destroying their base. Towers can be equipped with many kinds of weapons, but generally are unable to move. Resources earned by defeating enemies allow for more towers to be built.