Are you curious about how each item is working?
When you tab each item, you can see its description and price. Please refer to the below for detailed information.
1. Bomb - Removes everything in a radius of 2
2. Rainbow - Can be matched with any bubbles
3. Lightning (Light Blue one) - Removes a row of everything
4. Beam Shot (Greenish yellow one) - Removes everything in its way
Moreover, every time new bubble or item appears in a level, it will explain you how it works and what it is in the level. Please don't skip any instruction when it pops up during playing game. It may give you important tips to earn higher score.