There is a path. The path can be long and meandering, or short and nearly straight, or a series of paths. Suddenly, from one end of the path will come balloons. If the balloons make it to the end of the path, lives are lost. Put towers along the path to combat the balloons. And by towers we mean, of course, monkeys. Each balloon you pop brings in money which can be spent on different towers or upgrading the towers to make them more deadly to the evil balloons. Begin with the simplest form: a dart monkey. The dart monkey can shoot darts at the oncoming balloons, but only pop one at a time. However, the humble dart monkey can be upgraded to pop more balloons, to move faster, cover more area, etc. A handy feature, as the balloons coming down the pike increase in speed and complexity. Returning are familiar defenses such as the dart monkey, the tack tower, boomerang monkey, super monkey and plenty more, each with its own battery of improvements. Place a monkey ace and watch it circle the battlefield in a figure eight pattern, continually shooting and dropping pineapple bombs. There's also a monkey buccaneer ship which can be placed in water to defend nearby areas of the path. You can even drop a banana plantation to generate extra money and, presumably, food for the troops!