Bloons Tower Defense 4 or if you want at the short name BTD4 of Friv.com the shois a fun tower defense game that conveniently runs in all web browsers with an active internet connection. The game content is enriched with new maps, towers and game modes. Deflation is a brand new mode that gives players lots of money at the start but the trick is that they cannot earn more by blowing balloons up. Tower Specialties become available after players successfully complete all the previous challenges. After you succeeded to win the first three games now comes new mode that gives players the chance to purchase their favorite towers at discounted prices but there’s a catch. All the other towers become more expensive. But that's just little bit of what awaits you in the new game of Bloons Tower Defense BTD4 of Friv.com site. Play and discover some innovations and upgrades that await you in this cool game. New tracks, towers and defense structures, New colored balloons with modern weapons and forces going to surprise you!