Plants vs Zombies Stage 3-1 introduces a new part of your house, the swimming pool! This invites new zombie to the backyard, Ducky Tube Zombie who is able to wear Cone or Metal Bucket to increase its toughness. Use Lily Pad on swimming pool to allow plants to be placed on that tile. However, you can’t plant a Potato Mine on Lily Pad, only on soil!
Zombies: Zombie, Conehead Zombie, Ducky Tube Zombie.
Plants: Sunflower, Lily Pad, Cherry Bomb, Walnut, Repeater, Snow Pea, Potato Mine
Unlocks: Squash (1 time use like Cherry Bomb)
Final Layout

Plants vs Zombies Stage 3-2 introduces Squash which is an instant use plant similar to Cherry Bomb, but does not have carry the cool explosion effect! It is capable of squashing multiple zombies provided they are all stacked up tightly. This can be done by having a Walnut barrier to hold mobs of zombies within a position, and then place a Squash to clear them in a single go.
Before you start this battle, your neighbor Dave will be selling you an upgrade of 8 Seed Slot for $5000. This can happen on any stage provided you have first achieve $5000 cash in hand. I just bought it to be able to carry more variety of Plant Cards.
Zombies: Zombie, Newspaper Zombie, Ducky Tube Zombie, Conehead Zombie, Headgear Zombie
Plants: Sunflower, Potato Mine, Snow Pea, Repeater, Chomper, Lily Pad, Squash, Walnut
Unlocks: Threepeater
Final Layout

Video Walkthrough
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Plants vs Zombies Stage 3-3 introduces Threepeater! Its basically a Pea Shooter that shoots a pea in 3 lanes but consumes only 1 vacant soil. Plant Threepeater on row 2 and 5 to cover all zombie lanes. Planting them on Row 1 and 6 waste 1 Pea shot. Support Threepeater with Snow Pea to slow down incoming zombies.
This stage also introduces Snorkel Zombie that submerges in your swimming pool. While submerge, Peas can’t hit it. You will need to have Walnuts on Lily Pad, both stationed at column 6. Reason being, the Walnut will force Snorkel Zombies out of water and chomp its body, buying some time for offensive plants to knock it out. Also, during the final zombie invasion wave, random zombies will appear, at most at 6 column in swimming pool.
Completing this stage unlocks Tangle Kelp, an aquatic plant that pulls zombie underwater to drown them, a solution towards getting rid of Snorkel Zombie instantly!
Zombies: Zombie, Conehead Zombie, Snorkel Zombie.
Plants: Sunflower, Potato Mine, Snow Pea, Threepeater, Lily Pad, Walnut, Squash, Cherry Bomb.
Unlocks: Tangle Kelp
Final Layout

Plants vs Zombies Stage 3-4 introduces Tangle Kelp, an aquatic plant similar to Lily Pad, only can be placed in water which in that case, our swimming pool. I find it awkward to have plants in my swimming pool though. But it could not be help since zombies wants to invade via the pool using Snorkels and Ducky Tubes.
Tangle Kelp is useful in putting zombies out of your house, especially Snorkel Zombies who avoids being targeted by Peas while submerged. Place a few Tangle Kelps nearby your walnut to prevent them from Snorkel Zombies from chomping their hard shell.
Upon completing this stage, you will find Dave’s car key, which will leads you to more buying options! Dave car trunk will have premium upgrades for plants such as 9 Seed Slot upgrade, Pool Cleaner (wipes out all zombies within a single lane when zombies manage to get into your house), Garden Rake (takes out first zombies that steps on it, only lasts for 3 gameplays), Twin Sunflower (double sunlight production) and Gatling Peas (doubles Repeater Pea shot).
Zombies: Zombie, Conehead Zombie, Snorkel Zombie.
Plants: Sunflower, Potato Mine, Snow Pea, Threepeater, Lily Pad, Walnut, Squash, Cherry Bomb.
Unlocks: Tangle Kelp
Final Layout

Video Walkthrough
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Plants vs Zombies Stage 3-5 introduces a mini game where your objective is to stop mini zombies from invading into your house! Although tiny in size, they still remain as strong as ever. You will be getting your seed card supply via a conveyor belt.
Plant Walnut on the 4th column starting from the left, while Pea Shooters are planted depending on where the first zombie arrives. Use Cherry Bomb to destroy zombies that are not protected by Pea Shooter or tough zombies such as Headgear Zombie.
Upon completing this stage, you will unlock Jalapeno. It’s a plant which instantly destroys an entire lane of zombie (back and front) the moment when it is planted on to a vacant soil.
Zombies: Zombie, Conehead Zombie, Headgear Zombie, Snorkel Zombie, Ducky Tube Zombie.
Plants: Pea Shooter, Lily Pad, Walnut, Cherry Bomb.
Unlocks: Jalapeno.
Final Layout

Plants vs Zombies Stage 3-6 introduces Zomboni, a zombie that drives an ice truck. The path that is crossed by the ice truck will be covered with ice, preventing you from planting any plants on the vacant soil. This can be undone by melting those ice path using Jalapeno.
Another way is to simply breakdown that truck using many peas shot by Repeaters before it could make its ice path or Chomper with instant kill. Snow Pea has no effect against this truck though. A Potato Mine will also do the trick by destroying Zomboni vehicle! Same goes with Squash, Cherry Bomb and Doom Shrom. Completing this stage unlocks Spike Weed, the solution to Ice Truck encounter.
Zombies: Zombie, Conehead Zombie, Ducky Tube Zombie, Zomboni.
Plants: Sunflower, Potato Mine, Walnut, Snow Pea, Repeater, Lily Pad, Jalepeno, Squash.
Unlocks: Spike Weed.
Final Layout

Plants vs Zombies Stage 3-7 introduces Spike Weed, a plant that pops tires like the ones from Zomboni (Ice Truck) thereby destroying it instantly, but it will sacrifice itself as well. It can also hurt all zombies that walked over it.
Plant Spikeweed after you have your Snow Pea and Repeaters up at the very front garrison where the zombie first appear on that vacant soil. This will allow Spikeweek to poke Zombies feet, hurting them as they pass by. Also, it can destroy Zomboni instantly without having them to freeze the soil. Upon completing this stage, you will unlock Torchwood, a damage amplifier specially made for Peas.
Zombies: Zombie, Conehead Zombie, Ducky Tube Zombie, Zomboni, Buckethead Zombie, Snorkel Zombie.
Plants: Sunflower, Potato Mine, Walnut, Snow Pea, Repeater, Lily Pad, Jalepeno, Spike Weed.
Unlocks: Torchwood.
Final Layout

Plants vs Zombies Stage 3-8 introduces Torchwood. It’s a stump with glowing fire on top of its head. This fire engulfs any peas including Snow Pea into Fireballs. Fireballs does splash damage and also removes the slow freezing effect caused by Snow Pea or any plants that curse zombies with freezing effect. So if you are into Fireballs, just go with Pure Repeaters (with Gatling Gun) or Threepeater, without Snow Pea.
This stage also introduces a new zombie, Dolphin Rider Zombie that is capable of jumping over a plant on your swimming pool, similarly to how a Pole Vaulting Zombie jumps over a plant on land. It is pretty fast with the Zombie Dolphin swimming across your swimming pool.
To stop it, plant a Lily Pad to force it to jump over and slow down its movement. Or use Tangle Kelp to drown any water zombies instantly. Completing this stage unlocks a tall walnut, specially made to prevent zombies from leaping over.
Zombies: Zombie, Conehead Zombie, Ducky Tube Zombie, Zomboni, Buckethead Zombie, Snorkel Zombie.
Plants: Sunflower, Potato Mine, Walnut, Snow Pea, Repeater, Lily Pad, Jalepeno, Spike Weed.
Unlocks: Tall-Nut.
Final Layout

Plants vs Zombies Stage 3-9 introduces Tall-nut. It is a successor of Walnut but with a taller sturdier body. With its massive height, it is capable of blocking zombies that has the ability to leap over it. It’s massive size does not seem to bother Lily Pad from keeping it afloat.
Plant Tall-nut at column 4 from the left to prevent random zombies from appearing at the final wave and prevent Dolphin Zombies from charging into your aquatic plants. Plant Torchwood just before Tall-Nut, and serve Peas using Threepeater planted at row 2 and row 5.
Upon completing this stage, you will receive a note left by the Zombies ‘Hello, We herd you were having a pool party. We think that iz fun. Well be rite over. Sincerely, the Zombies. Well that basically means they are going to perform a full-scale attack on your Swimming Pool house on daytime!
Zombies: Zombie, Conehead Zombie, Buckethead Zombie, Pole Vaulting Zombie, Dolphin Rider Zombie, Zomboni, Ducky Tube Zombie.
Plants: Sunflower, Potato Mine, Tall Nut, Threepeater, Torchwood, Spike Weed, Tangle Kelp.
Unlocks: A Note from Zombies.
Final Layout

Plants vs Zombies Stage 3-10 is the final battle against zombies on Swimming Pool during daytime. Usually in final battle, conveyor belt will be the one providing random plants to aid with your house defenses! Follow the same layout as Stage 3-9, where Tall Nuts are on 4th column from the left, followed by Torchwood behind it, and populating Threepeater on vacant soil behind Torchwood.
Completing this stage unlocks a new aquatic plant, Sea-Shroom and explore the nighttime of swimming pool area! This is where the Mushrooms starts becoming active in protecting your house from zombie invasion at night.
Zombies: Zombie, Conehead Zombie, Buckethead Zombie, Snorkel Zombie, Dolphin Rider Zombie, Zomboni, Ducky Tube Zombie.
Plants: Threepeater, Torchwood, Tall-Nut, Lily Pad, Jalapeno, Squash, Spikeweed.
Unlocks: Sea-Shroom + Swimming Pool Nighttime.
Final Layout

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Where the Play link?
@2fast4U(ToofastforU)
Thanks 2fast4u. I realized that :D
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You skipped the second level