Bloons Tower Defense 4 is a popular tower defense game featuring more than 50 levels and over 15 tower types. Game comes in five different mode from easy to apocalypse. Set up your defenses at strategic place to destroy the incoming balloons. There are different colored balloons and each will take different amount of hits to pop. Red balloon will take 1 hit, blue will take 2, green will take 3 hits to pop. As you advance through the levels power and number of incoming balloons will increase making the game a bit more difficult and challenging. Instructions: Use mouse to place the towers.