Boosters are aids that help you beat tough levels. For example, a Bag of Chips that you buy right before a level starts is a booster, so is the Hammer that you can buy when you're already playing a level.

Here's how you can get them:
✅Buy boosters while playing levels or before they start.
✅Get them as rewards for uniting entire animal families.
✅Find them in Star Chests and Zoo Chests.
✅Buy them at the Store.

The boosters that you buy before a level starts appear on the game field right away. If you buy a booster while you're playing a level, you get to decide which cell you're going to use it on, so you can make the most of it.