Check mark booster?

Ah, you mean the pink booster? Has a checkmark?

That's called Lucky Candy. When you use it, it will help you complete orders. When it is matched, it turns into the thing you need to collect. (E.G. If you need to collect Frosting, Lucky Candy can turn into that.)

There is a limit to what it can turn into. Lucky Candies cannot spawn Dragons or Jelly for example.

If you are bored while the server is down, maybe you might like to read some of my tips that I posted a few weeks ago….