Bloons TD 4 was released on October 26, 2009, as an online freemium game with a proprietary iOS version released on December 7, 2010, developed in conjunction with Digital Goldfish. A sandbox mode allows experimentation with weapons and enemies, a new bloon called the BFB (Brutal Floating Behemoth), and an apopalypse mode makes the gameplay continuous without pausing between levels.
The gameplay underwent changes including a graphical update, the ability to save the current game, and the introduction of an unlock-based leveling system. The tower upgrading system received various changes including increasing the number of upgrades per tower, and new maps and game modes were added. With the introduction of these new maps, water tiles were available, a mechanic which allows you to place the new Monkey Buccaneer.
iPhone and iPad versions of this title have been purchased over one million times. A version of the game was also released as a DSiWare game in 2012.
On July 8, 2010, Bloons TD 4 received a standalone “expansion pack” called Bloons TD 4 Expansion which added the Dartling Gun and Spike Factory towers, both of which would remain in future games, 4 new tracks, a new game mode called “Deflation”, and a new “Tower Specialties” game mechanic. The latter allows the player to specialize in a certain tower type.
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