<P> Bloons Tower Defense is the first game in the BTD series, released for free as a flash browser game in Mid 2007 . In the game players had to defend against coloured bloons with monkeys, dart throwers, and other towers positioned around the map . When strong bloons are popped they release weaker ones until eventually completely popping . </P> <P> Bloons Tower Defense 2 was released soon after in Late 2007, adding new towers, multiple map options, new bloons, and an option for game difficulty . </P> <P> Bloons TD 3 was released around September 5, 2008, months after the release of Bloons Tower Defense 2, named differently due to a trademark dispute with Com2uS . As with the second game, new towers, bloons, and maps were added . </P> <P> A version based on this game was released for iOS titled Bloons TD; made available on October 3, 2009 from the iOS App Store . This version had extra maps styled in snow and beach themes, and included OpenFeint achievements . </P>

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