Reach level 8.
To get prizes from the Colorful Adventure mini-event, you need to complete all the puzzle levels.
You get 3 attempts to complete the event. Don't be discouraged if you use up your last attempt. You can start the event over, and the prizes remain the same!

In this event, you can use a Star Wand tool, which removes a tile of your choice.

After you complete the main stage of the event, an additional stage opens, completing which gets you valuable prizes!