Swappers are boosters that are available when you’re in the middle of playing a level. The icon is located on the level goal sidebar next to the Hammer booster.
Swappers let you swap any two pieces on the field without spending a move.
Here’s how you use this booster:
1. Tap the icon
2. Tap one of the pieces you want to swap
3. Tap the second piece
Watch the pieces swap places.
You can buy the Swapper booster while playing a level or receive it as a daily bonus.