More Bloons is a simple launcher game. It is about a monkey using darts to pop colored balloons called Bloons. More Bloons is a sequel or expansion to Bloons. The gameplay is the same, but with additional levels.
You're given a small monkey with a handful of darts. The game has 50 levels and the goal on each level is to pop as many Bloons as possible by throwing darts at them. To throw, you aim and hold down the mouse button to gauge the power of the throw, then release the mouse button to send the dart flying. To beat the current level and unlock the next level, you have to pop enough Bloons to reach the target percentage of Bloons and you only have a certain amount of darts on each level. Hitting special types of Bloons gives special effects on the level, such as tacks shooting out from a Bloon, throwing triple darts, ice Bloons, exploding Bloons, and boomerangs. There's even a Pac-Man Bloon which summons Pac-Man and lets you guide it around to eat up more Bloons. There is one new Bloon that was not in the original game: the boomerang Bloon.
There's an Unlimited Darts Mode which allows you to play a level with unlimited darts in order to get 100% of the Bloons on that level. This mode is only intended to allow the user to experience all the levels and it does not allow for high scores. Beating a level using this mode does not unlock the next level in regular mode.