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''Bloons Tower Defense'' (also known as Bloons TD) is a series of tower defense games under the ''Bloons'' series produced and created by Ninja Kiwi. The game was initially developed as a browser game, built upon the Adobe Flash platform and released in 2007. Later games in the series expanded to support various mobile platforms, including Android, iOS, Windows Phone, PlayStation Portable and Nintendo DSi. In the game, players attempt to prevent balloons (called bloons in-game) from reaching the end of a set course by placing towers along it; units which can pop the bloons in a variety of ways. Money is gained by popping balloons and completing levels, and can be spent on extra towers or upgrades for existing ones or even special items such as exploding pineapples and monkey tacks. The series has received mixed reception, with most games reviewed well. Some versions have been described as the best free tower defense games for their platform while criticism for the games has largely been due to lack of innovation in recent games and performance issues. == Gameplay == The main objective of ''Bloons TD'' is to prevent balloons, known in-game as "bloons", from reaching the end of a defined track on a map which consists of one or more entrances and exits for the bloons. The game is a tower defense game and thus the player can choose various types of towers and traps at his or her disposal to place around the track in order to defend against the bloons, gaining points for every bloon popped.〔 If a bloon reaches the end of a path, the player loses lives (or in later games, health); once these are depleted, the game ends.〔〔 Bloons follow the map's set path on the track until they either reach the exit(s) or are popped. There are multiple types of bloons, with tougher variants containing a number of weaker ones.〔 In some versions of the game bloons possess special abilities, or strengths, that resist certain tower types. With each level, the intensity of bloon waves proportionately increases.〔 Towers are the main defensive utility in the ''Bloons TD'' series. Each tower has its own unique purpose, power, and use, with some being powerful against specific bloons but unable to target others effectively. Every tower can be upgraded to increase power and other capabilities by spending the in-game currency, known simply as 'money', which is earned by popping bloons and at the end of each round.〔 In ''Bloons TD 4'' and ''Bloons TD 5'', certain towers can be placed to produce additional money.〔 In later games, there are 4 difficulty levels to play each level on, and there are 4 different types of maps rated by difficulty; beginner, intermediate, advanced and expert. With each harder difficulty the player plays on, the less lives they have and the more each tower and upgrade cost. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bloons Tower Defense」の詳細全文を読む スポンサード リンク
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