The Crown Rush event lets you earn items to help you at the beginning of a level!
You earn 1 Rotor and 1 TNT at the beginning of a level after completing a level. If you complete the next level without losing, you get to start the next level with 2 Rotors and 2 TNTs. Finally, if you complete another level without losing, you will get 3 Rotors and 3 TNTs at the beginning of the levels!
When you fail to complete a level, you will need to start over to earn the items at the beginning of the level again.