Zombies Enemy: Regular Zombie, Conehead Zombie, Ducky Tube Zombie, Dolphin Rider, Buckethead, Zomboni, Snorkel Zombie
Recommended Plants: Auto
Reward: Sea-Shroom Plant
For this stage, you will get a ton of threepeaters which you will use them all in the backrow. Place the torchwood somewhere in the middle behind your tallnut. Then place the spikeweed right in front of your tallnut to defend them against Zombonis.
Save the tangle weeds and jalapenos against any zombies that break through your defense. Lastly, if you are overstocked with lily pads, just throw them into the pool. This stage is pretty simple to beat.