Power Bottle - These restore your CP meter which allows you to participate in new matches. They're available in a variety of quantities and prices vary by region, so check inside the shop via your device.
Shuffle - This boost will shuffle all of the tiles on the grid if you've found yourself hopelessly out of your depth in a round!
Brush - If you want to get your own back on your opponent, brush aside that bucket of sand that's graying out your screen with one of these brushes.
Red Wine - Send the boss packing with a tipple! Using one of these will remove all of the boss faces from the grid.