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Tower defense ( TD) is a subgenre of strategy games where the goal is to defend a player's territories or possessions by obstructing the enemy attackers or by stopping enemies from reaching the exits, usually achieved by placing defensive structures on or along their path of attack."Best Tower Defense Games of All Time. Damon Reece. April 27, 2015 This typically means building a variety of different structures that serve to automatically block, impede, attack or destroy enemies. Tower defense is seen as a subgenre of real-time strategy , due to its real-time origins, even though many modern tower defense games include aspects of turn-based strategy. Strategic choice and positioning of defensive elements is an essential strategy of the genre.
While later arcade games like Defender (1981) and Choplifter (1982) lacked the strategy element of Missile Command, they began a trend of games that shifted the primary objective to defending non-player items. In these games, defending non-players from waves of attackers is key to progressing. Parker Brothers 1982 title for the Atari 2600 was one of the first to popularize the base defense style. The concept of waves of enemies attacking the base in single file (in this case ) proved a formula that was subsequently copied by many games as the shift from arcade to PC gaming began. Players were now able to choose from different methods of obstructing attackers' progress. (reprinted in The Comics Journal. No.85. Pg.108. October 1983. ; later reprints in Ellison collections Sleepless Nights in the Procrustean Bed (1984) and An Edge in My Voice (1985)). Sorcerer's Apprentice for the Atari 2600 featured Mickey Mouse and was first published in 1983.
Nintendo's popular 1980s Game & Watch handheld games featured many popular precursors. With their fixed sprite cells with binary states, games with waves of attackers following fixed paths were able to make use of the technical limitations of the platform yet proved simple and enjoyable to casual gamers. Vermin (1980), one of the first, tasked players with defending the garden (a theme followed by many later games) from relentless horde of moles. The following years saw a flood of similar titles, including Manhole (1981), Parachute (1981), and Popeye (1981). 1982 saw multiple titles with the primary object of protecting buildings from burning: Fire Attack, Oil Panic and Mickey & Donald. The later titles utilized multiple articulating screens to increase the difficulty for players. With two screens these games introduced basic resource management (e.g. oil and water), forcing players to multitask. Green House (1982) was another popular two screen game in which players use clouds of pesticide spray to protect flowers from waves of attacking insects. Despite the early rush of archetypal titles, ultimately there was a general decline in fixed-cell games, due to their technical limitations, simplistic gameplay, and the rise of personal computers and handhelds the Game Boy; correspondingly, this genre also declined. A rare exception was Safebuster (1988 multi-screen) in which the player protects a safe from a thief trying to blow it up.
By the mid-1980s, the strategy elements began to further evolve. Early PC gaming examples include the 1984 Commodore 64 titles Gandalf the Sorcerer, a shooter with tower defense elements, and Imagine Software's 1984 release Pedro. Pedro, a garden defense game, introduced new gameplay elements, including different enemy types as well as the ability to place fixed obstructions, and to build and repair the player's territory.
While Rampart was popular, similar games were rarely seen until the widespread adoption of the computer mouse on the PC. The DOS title Ambush at Sorinor (1993) was a rare exception from this era. Tower defense gameplay also made an appearance on consoles with several in the Final Fantasy series, including a tower-defense minigame in Final Fantasy VI (1994) and the Fort Condor minigame in Final Fantasy VII (1997), which was also one of the first to feature 3D graphics. Attack of the Mutant Penguins for the Atari Jaguar and MS-DOS was released in 1995. Dungeon Keeper (1997) had players defend the Dungeon Heart, a gigantic gem at the centre of your dungeon, which, if destroyed, would cause the player to lose the game. Fortress was released for the Game Boy Advance in 2001.
As real-time strategy games gained popularity in PC gaming, the easy proliferation of user-created scenarios on Battle.net expanded the genre rapidly. Custom maps for such as Turret Defense (May 2000) and Sunken Defense (November 2001) were early examples of the genre that retained popularity for decades. Both were released early in the game's lifecycle and had various versions evolve in parallel over time due to the open-source nature of maps.
(2002), another real-time strategy game capable of such scenarios, added role-playing elements to them. The expansion (2003) included a secret tower-defense scenario in one of the official campaigns. Custom maps included Element TD and Gem Tower Defense, from February 2006, which were initially created in Warcraft III World Editor.
The genre's success also led to new releases on PC and video game consoles. Popular 2008 titles included PixelJunk Monsters released in January, and Savage Moon in December. Also released in 2008 were geoDefense Swarm, geoDefense, GemCraft, Fieldrunners, and Crystal Defenders. GauntNet was released in April 2009. Plants vs. Zombies released in May 2009 was another highly popular tower defense which became a successful series on mobile devices. Also released that year were Sentinel, TowerMadness, Babel Rising, Creeper World, Sol Survivor, Comet Crash, , South Park Let's Go Tower Defense Play!, Starship Patrol and Trenches.
With the arrival of Apple's App Store tower defense developers adapted quickly to the touchscreen interface and the titles were among the most downloaded, many of them ported directly from Flash. Kingdom Rush, first released in 2011, sold more than seventeen million copies both on App store and Play Store.
The 2011 title Sanctum, and its 2013 sequel popularized the first person shooter hybrid that was pioneered by these earlier games. Orcs Must Die! also integrated the FPS genre into a fully 3D environment and went to have several sequels. released in 2011 introduced a variation of gameplay which has been described as "reverse tower defense", "tower attack", and "tower offense". In the game, the player must attack the enemy bases protected by numerous defenses. Sequels and other games have since experimented further with both styles of tower defense. Tiny Heroes, , Iron Brigade, Rock of Ages and Trenches 2 were also released in 2011.
Defender's Quest, Bad Hotel, Toy Defense, Strikefleet Omega, Unstoppable Gorg, Defenders of Ardania, Orcs Must Die! 2, Fieldrunners 2, Dillon's Rolling Western, Oil Rush and Elf Defense Eng all came out in 2012. Around this period the genre matured, gaining recognition as a distinct sub-genre of strategy games and returning in numerous upgraded versions. Chain Chronicle and CastleStorm were released in 2013. Plants vs. Zombies 2 came out and featured deck-building mechanics. 2014 saw a number of brand new titles including Space Run, Dungeon of the Endless, Island Days, Final Horizon and The Battle Cats as well the return of , Defense Grid 2 and TowerMadness 2. Deathtrap and Krinkle Krusher were first published in 2015.
More recent titles in the genre include (2017), Tower Battles(2017) and Orcs Must Die! Unchained (2017), Dillon's Dead-Heat Breakers (2018), (2018), Aegis Defenders (2018), Bloons TD 6 (2018), Tower Defense Simulator (2019), Arknights (2019), Taur (2020), Element TD 2 (2020), Buster's Tower Defense (2021), and Path to Nowhere (2022).
With the advent of social networking service applications, such as the Facebook Platform, tower defense has become a popular genre with titles such as Bloons TD and Plants vs. Zombies Adventures making the transition to turn-based play. Recent releases include Star Fox Guard and McDroid which came out in 2016.
In a tower defense, the player's main character is often invincible, as their primary objective is the survival of the base rather than the player.
Some features of modern tower defense:
Many modern tower defense games evolved from real-time to turn-based, cycling through distinct gameplay phases such as build, defend, repair, and celebrate. Many games, such as Flash Element Tower Defense feature enemies that scamper through a "maze", which allows the player to strategically place "towers" for optimal effectiveness. However, some versions of the genre force the user to create the "maze" out of their own "towers", such as Desktop Tower Defense. Some versions of the genre are a hybrid of these two types, with preset paths that can be modified to some extent by tower placement, or towers that can be modified by path placement, or modifications that can be placed by tower paths. Often an essential strategy is "mazing", the tactic of creating a long, winding path of towers (or "maze") to lengthen the distance the enemies must traverse to get past the defense. Sometimes "juggling" is possible by alternating between barricading an exit on one side and then the other side to cause the enemies to path back and forth until they are defeated. Some games also allow players to modify the attack strategy used by towers to be able to defend for an even more tantalizingly reasonable price.
The degree of the player's control (or lack thereof) in such games also varies, from games where the player controls a unit within the game world, to games where the player has no direct control over units at all, or even no control over the game whatsoever.
A common theme in tower defense games to have occasional "air" units which ignore the layout of the board (i.e. maze paths or obstructions) and travel directly to the end destination, or enemies which prioritize different targets than their main destination.
Some tower defense games or custom maps also require the player to not only defend their own board but send out enemies to attack their opponents' game boards (or opponent-controlled areas of a common game board) in return. Such games are also known as tower wars game boards.
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