The fog covers the four rightmost columns on this level, leaving five columns visible for the player.
The player may not be ready for the Dolphin Rider Zombie in the fog. Without knowing which pool lane it will show up in, it is difficult to defend against it.
Begin by planting Sun-shrooms, Puff-shrooms, and Sea-shrooms for basic defense in the beginning of the level. Then, plant a Cactus on every lane to defend yourself against Balloon Zombies.
Use Blovers only when a Balloon Zombie is near your house. This is to blow away more Balloon Zombies at a time and to save Blovers, as they may be more in the fog.
If time permits, plant a Snow Pea on every lane to slow down the zombies, so you have extra time to damage them.
If a Dolphin Rider Zombie comes, plant a Sea-shroom on the second column of the corresponding lane.