Starting from the release of Bloons TD 5, several spin-off games of the series were released.

Many additional features have been added since Bloons TD 4, with unlockable towers and upgrades, as well as new game modes and special challenges. Difficulty modifiers have been added since the third game of the series, Bloons TD 3. Every new Bloons TD sequel introduces a number of new tower types along with their upgrades, new and bigger bloons enemies, as well as new tracks.

The first game of the Bloons TD series, Bloons Tower Defense, borrows existing elements of the original Bloons games into a tower defense, starting off with relatively simple game mechanics. Because of how popular this game series is, a number of additional spin-off games in the series were created. In these games, most of them are single-player, supported mostly by pre-determined rounds.

Throughout all games, the main goal is to pop as many bloons with towers as possible while preventing the floating bloons from reaching the exit. The Bloons TD series is a series of tower defense games, taking elements of the original Bloons game into a tower defense style.

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