How to use Boosters?

Boosters are items that you can use to increase your chances of success.

You can get them in several ways:
1. Collecting an item in a building that creates a Boosters;
2. Base upgrade award;
3. Promo code entering;
4. Roulette.

You can get 6 types of Boosters if you complete the tutorial.

Please note that it is not possible to use 2 identical or/ and 2 noncommon boosters at once.
Also, some boosters will not be available for some sections of cases.