Make matches next to the Oyster to open it up. Make another match when it's open or it'll close! Make matches next to the open Oyster immediately, or it'll close!
Seaweed traps pieces! Match pieces inside the Seaweed with other pieces to remove them.
Break Sea Shells by matching pieces next to them or using Blasters or collect Seashells by matching pieces next to them or using Blasters, depending on the level.
Make matches next to the Sponge and collect the Bubbles!
Bring Starfish to the bottom of the board to collect it.