Bloons Tower Defense 4 Expansion NOW UPDATED WITH NEW THE NEW TOWERS! Use your favourite new towers, the Dartling Gun and the Spike Factory in this awesome expansion pack for BTD4. Bloons Tower Defense 4 Expansion contains 4 brand new crazy fun tracks for you to try out. Mesmerise yourself on the Sandy Spiral Track, get lost in the Subterrainian Sewers, explore the secrets of the Monkey Temple, or
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