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Tower defense or tower defence (see writing system differences) may be a subgenre of period strategy video games.[1][2] The goal of tower defense games is to do to prevent the enemies from reaching a selected purpose on the map by building a spread of various towers that shoot at them as they pass. Most towers square measure wont to injury, others wont to snare and poison the enemy, interference towers also are used. Enemies and towers typically have varied skills, costs, and upgrade costs. once Associate in Nursing enemy is defeated, the player earns cash or points, that square measure wont to obtain or upgrade towers, or upgrade the quantity of cash or points that square measure earned , or maybe upgrade the speed at that they upgrade.[3]

The choice and positioning of the non-public towers is that the essential strategy of the sport. Many games, like Flash component Tower Defense, feature enemies that run through a "maze", that permits the player to strategically place towers for best effectiveness.[4] but, some versions of the genre force the user to form the maze out of their own towers, like Desktop Tower Defense.[5] Some versions square measure a hybrid of those 2 sorts, with predetermined methods which will be changed to some extent by tower placement, or towers which will be changed by path placement.

A prototypic tower defense game was the Atari Games unleash wall in 1990.[6] By the first 2000s, maps for StarCraft, Age of Empires II, and Warcraft III were following in Rampart's footsteps.[6] The Fort cathartid strategy minigame in Final Fantasy VII might also have galvanized the tower defense genre because it contains many components that square measure currently genre mainstays.

Eventually, freelance game developers began victimization Adobe Flash to form complete tower defense browser games,[7] that light-emitting diode to the discharge of Flash component Tower Defense in Jan 2007[8] so Desktop Tower Defense in March of identical year.[9][10] Desktop Tower Defense became vastly widespread Associate in Nursingd earned  an freelance Games competition award,[11] and its success light-emitting diode to a version created for the movable by a distinct developer.[12] many different tower defense video games achieved tier of fame, together with GemCraft[13] and Plants vs. Zombies.[14]

By 2008, the genre's success light-emitting diode to tower defense games on game consoles like Defense Grid: The arousal on the Xbox 360,[15] and PixelJunk Monsters and Savage Moon for the PlayStation three.[6] Tower defense games have conjointly appeared on hand-held game consoles like Lock's Quest and Ninjatown on the Nintendo DS.

Tower defense games square measure defined by the positioning of static units by the player to defend against mobile enemy units WHO try to induce from a begin purpose to Associate in Nursing finish purpose. there's a collection variety of enemy units (or 'damage' the player will take from units reaching the tip purpose) WHO will reach the tip point before the extent is lost. Some games use a static route that the enemy units follow around that the player places their towers, whereas others favour a free-form surroundings that permits the user to outline the trail the enemy units take. Some games use a combination of each. Most games enable the upgrading of the player's towers.

Often an important strategy is "mazing", that is that the manoeuvre of making a protracted, winding path of towers to elongate the gap the enemies should traverse to induce past the defense. typically "juggling" is feasible by alternating between barricading Associate in Nursing exit on one aspect so the opposite aspect to cause the enemies to path back and forth till they're defeated. Some games conjointly enable players to change the attack strategy employed by towers to be ready to defend for an excellent a lot of cheap worth.[17]

The degree of the player's management (or lack thereof) in such games conjointly varies from games wherever the player controls a unit inside the sport world, to games wherever the player has no direct management units the least bit.

It is a typical theme in tower defense games to possess air units that don't meet up with the layout of the maze, however rather fly over the towers on to the tip destination.

Some tower defense games or custom maps conjointly need the player to send enemies to their opponents' game boards severally their controlled areas at a typical game board. Such games also are referred to as tower wars games.

USPTO trademark[edit]

On June 3, 2008 - COM2US Corporation was awarded the trademark for the term "Tower Defense", filed on Gregorian calendar month thirteen, 2007 - serial variety 3442002. The corporation has been rumored to start out implementing the trademark;[18] specifically on the iOS platform as variety of tiny or freelance developers square measure currently receiving messages from Apple citing trademark violation.[citation needed] Adding the phrase "Tower Defense" (in capital letters) to the outline of Associate in Nursing app submission to iTunesConnect and therefore the app store mechanically bequeaths a warning informing you that your submission is probably going to be rejected to be used of the term; but, writing the phrase in lower-case letter remains acceptable as "tower defense" may be a valid description of a game vogue.