Teasing Bloon

When the Teasing Bloon appears, it does so in an area outside the range of your towers, and then just sits there. It only takes 1 hit to beat, but is impossible to hit unless you can increase the range of a tower to include it, or buy a new tower. It can't cause you to lose any lives, but you can't continue to another round until you have beaten it. If necessary, you might even have to sell a tower to get enough money to do something that will let you beat it.