Match 5 tiles of the same color to unlock the most powerful bonus tile - the Butterfly! A butterfly removes all tiles of a single color from the board - just swap it with the color tiles you want removed!
If you swap a butterfly with a striped tile, each of that colored tile (for example a red tile) will also turn into a striped tile.
If you swap a butterfly with a lily, three lilies will appear randomly on the board.
If you swap a butterfly with a sunflower, three sunflowers will appear randomly on the board.