The Rake removes pieces or one obstacle layer (e.g., one chain out of two) in a whole column and row without using a move.
To use this booster, click on the Rake icon and then click on the tile you’d like to use it for.
This booster is very handy for removing many obstacles all at once in a column and row or when you don't have enough moves left to complete the level goals.
You can buy the Rake booster when you're already playing a level, get it as a reward in events, or win it in the Lucky Spin!