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Tower defense or tower defence (see orthography differences) could 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 particular purpose on the map by building a spread of various towers that shoot at them as they pass. Most towers area unit accustomed injury, others accustomed snare and poison the enemy, block towers are used. Enemies and towers sometimes have varied talents, costs, and upgrade costs. once associate enemy is defeated, the player earns cash or points, that area unit accustomed get or upgrade towers, or upgrade the amount of cash or points that area unit attained, or maybe upgrade the speed at that they upgrade.[3]

The choice and positioning of the private 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 make the maze out of their own towers, like Desktop Tower Defense.[5] Some versions area unit a hybrid of those 2 varieties, with predetermined ways which will be changed to some extent by tower placement, or towers which will be changed by path placement.

Contents  [hide] 

1 History

2 Gameplay

3 USPTO trademark

4 References

History[edit]

A archetypal tower defense game was the Atari Games unleash bulwark 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 may additionally  have galvanized the tower defense genre because it contains many parts that area unit currently genre mainstays.

Eventually, freelance game developers began victimisation Adobe Flash to form complete tower defense browser games,[7] that semiconductor diode to the discharge of Flash component Tower Defense in Gregorian calendar month 2007[8] so Desktop Tower Defense in March of constant year.[9][10] Desktop Tower Defense became vastly widespread associated attained an freelance Games competition award,[11] and its success semiconductor diode to a version created for the movable by a unique developer.[12] many alternative tower defense video games achieved A level of fame, as well as GemCraft[13] and Plants vs. Zombies.[14]

By 2008, the genre's success semiconductor 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.[16]

Gameplay[edit]

A screenshot of Defenders of Ardania showing the genre's characteristic towers, furthermore as units associated a castle that is an finish purpose

Tower defense games area unit defined by the positioning of static units by the player to defend against mobile enemy units WHO try to urge from a begin purpose to associate finish purpose. there's a group range of enemy units (or 'damage' the player will take from units reaching the top purpose) WHO will reach the top 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 enables the user to outline the trail the enemy units take. Some games use a mix of each. Most games permit the upgrading of the player's towers.

Often a vital strategy is "mazing", that is that the plan of action of making a protracted, winding path of towers to elongate the space the enemies should traverse to urge past the defense. typically "juggling" is feasible by alternating between barricading associate exit on one aspect so the opposite aspect to cause the enemies to path back and forth till they're defeated. Some games conjointly permit players to switch the attack strategy employed by towers to be ready to defend for a fair additional affordable 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 in the slightest degree.

It is a standard theme in tower defense games to own air units that don't withstand the layout of the maze, however rather fly over the towers on to the top destination.

Some tower defense games or custom maps conjointly need the player to channelise enemies to their opponents' game boards severally their controlled areas at a standard game board. Such games are called 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 range 3442002. The corporation has been according to start out implementing the trademark;[18] specifically on the iOS platform as variety of tiny or freelance developers area unit currently receiving messages from Apple citing trademark violation.[citation needed] Adding the phrase "Tower Defense" (in capital letters) to the outline of associate app submission to iTunesConnect and also 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 small letter remains acceptable as "tower defense" could be a valid description of a game vogue