Click on a black button, then on the place that you want the tower to be placed. It will appear there. Note: You may only place 1 of each tower type. Move your mouse to the bottom to see a hint. This is based on Bloons Tower Defence. Go to www.ninjakiwi.com to play the original. This closely models the Drag Strip track, but you need to have a high rank to unlock it. For those that haven't played Bloons TD before, you need to pop the bloons in each level. The 'bloons ' are coloured balls that go along the track. If they reach the end, you lose lives! This is 'Apocalypse' mode, so there is a tiny break between each wave. Normally, you start the waves manually, but they come automatically. This is the last version. All future updates will be done on this version without renaming.