In Stack Ball Bump Bump, you play as a ball and you have to reach the bottom of the screen without hitting a black block.

To help you reach the bottom of the screen, there are different types of blocks that you have to avoid, such as black, red, blue, and green.

As you play the game, you will be able to collect coins and pick up gems. These gems will help you reach the bottom of the screen faster.

You can also unlock different skins for your ball by collecting enough coins. The skins will help you to look more attractive and cool.