Tower Defense
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Tower Defense or TD for short, is a genre of custom games, or non-regulated games with player determined rules, played within the videogame Warcraft III. The objective of a Tower Defense game is to defend an area from waves of enemies that move along a set path by building attacking towers. These games are not created by Blizzard, the developer who produced Warcraft III. They're created by players using the Warcraft III World Editor, a map construction program that is free with Warcraft III. This allows players to develop a variety of different towers, enemies and paths, as well as incorporate themes of their favorite subjects or topics.
[edit] Towers
The towers in Tower Defense games are used to eliminate enemies to protect a specific area by using one of Warcraft III's various allowable attacks. There is no standard appearance of a tower. Players can use any of the objects found in the game to become a tower, whether it be an actual representation, such as a Scout Tower, or a more abstract one, such as a fence post or rock. The Towers often cost resources, such as gold; however, since players create these games, there is no standard among them. To create these towers, the player must select their builder unit, a character with no role other than building the towers, select the tower they desire, and place it strategically on the map to most effectively eliminate their targets. Towers are usually categorized by either damage, attack type, cost, or armor. Often times, if a tower is placed in such a way that the enemy cannot move, it will spontaneously be destroyed to allow a fair game between the opponent and the player.
[edit] Examples
Some tower defense examples outside of Warcraft 3 but inspired by the game are and not limited to:
http://novelconcepts.co.uk/FlashElementTD/
http://www.handdrawngames.com/DesktopTD/
Sources:
