What is bubble shooter 4?

As an AI language model, I don't have access to current information about specific online games. However, I can provide you with some general information about bubble shooter games.

Bubble Shooter 4 is likely a version or sequel of the popular Bubble Shooter game. This type of game involves shooting bubbles of different colors at a cluster of bubbles hovering at the top of the screen. The objective is to create groups of three or more bubbles of the same color to make them pop and clear the screen before they reach the bottom.

Bubble Shooter games are known for their simplicity, addictive gameplay, and colorful graphics. They are often available to play for free online, and some versions can also be downloaded as mobile apps. Besides the classic version, there are many variations of the game, including themed versions, multiplayer options, and arcade-style challenges.