Stage 3-8

What? A new zombie? Here is the Dolphin Rider Zombie, an aquatic Pole Vaulting Zombie, but a bit faster.

Plants

 * Sunflower
 * Lily Pad
 * Peashooter/Repeater
 * Potato Mine
 * Squash
 * Threepeater
 * Torchwood

Zombies

 * Zombie
 * Conehead Zombie
 * Ducky Tube Zombie
 * Dolphin Rider Zombie

Strategy
Use the Sunflower-Potato Mine Strategy, adding the squash along the way. Plant Peashooting Plants when you have the sun. When a Dolphin Rider appears, plant a Lily Pad in the 8th column to make it jump. Easy.

Result

 * Tall-nut
 * Stage 3-9