Bloons Tower Defense 5 is a Bloons Tower Defense game that was officially released December 15, 2011 (December 13 for Ninja Kiwi accounts). According to Ninja Kiwi, the reason they released Bloons Tower Defense 4 Expansion was to tide the overwhelming demand for a new Bloons Tower Defense game, with BTD5 being so far from release at the time. This game is filled with new features such as: