A whole game idea :O Yes, this is loosely based around Angry Birds Seasons. (A game that's somehow still updating to this day, I may add. ) This blog will look specifically as what the worlds are and what plants they introduce.
Tutorial[]
Before you access any of the worlds, you have to beat 4 levels in front of your house. Each world has its own story.
Pilot worlds[]
The first 2 worlds in the game. They serve as an introduction for what's to come. Returning zombies will be in costumes.
Lawn of Doom[]
The first world in the game. After beating this and Feastivus, you can access any of the worlds afterwards.
Story: The plants discover Zomboss and Immorticia are making a secret potion to turn everyone onto what they are dressed as that night. Can the plants stop them before everyone is a zombie, skeleton, vampire, or whatever, permanently?
Based around: Halloween
Zombies: Basic: 
Already existing:
New:Pumpkinhead Zombie; Zombie Cat; Zombot Spook Master 1000
Main mechanic: Graves that summon zombies
Surprise attack: Graveyard Ambush!
Levels: 30 (Day 15 is the Gargantuar level, and Day 30 is the Zomboss fight)
Brain Busters: Last Stand, Save Our Seeds, Locked and Loaded, Special Delivery, Trick or Treat
Difficulty: 2 Jalapenos
Reward upon completing the world: Immorticia trophy
Feastivus[]
The second world in the game.
Story: Most of the plants have been good, but when Zomboss sends out an attack and puts all the plants on the naughty list, they now have to redeem themselves just before Christmas.
Based around: Christmas
Zombies: Basic: Feastivus Zombie, Feastivus Conehead, Feastivus Buckethead, Feastivus Flag Zombie, Feastivus Imp, Feastivus Gargantuar
Already existing:
Main mechanic: Frozen plants and zombies; presents that drop random items (coins, plants, gems, zombies, etc.)
Surprise attack: Gift Stealing Party!
Levels: 25 (12 is the Gargantuar battle, 25 is the Zombot battle)
Brain Buster: Last Stand, Save Our Seeds, Locked and Loaded, Present Delivery
Difficulty: 2 Jalapenos
Endless Zone: Zomboss' Workshop
Reward upon completion: Pianist Zombie trophy
Season 1[]
Season 1 helps you build up you collection, a little bit. Recommended to complete this season before moving on to other seasons.
Valenbrainz[]
The third world in the game.
Story: Blooming Heart works at a store in her spare time. She also likes zombies, and is friends with a few of them. They are nice zombies. They don't attack plants. Zomboss, however, wants to turn them against the plants. Blooming Heart won't let that happen, and she'll do what ever she can to prevent it. Meanwhile, Magnet-shroom has a crush on someone.
Based around: Valentine's Day
Zombies: Basic: Lovesmitten Zombie, Lovesmitten Conehead, Lovesmitten Buckethead, Lovesmitten Flag Zombie, Cupid Imp, Lovebitten Gargantuar.
Already existing:
Main mechanic: Love monsters (reskinned dinosaurs)
Surprise attack: Love Swarm!
Levels: 20 (10 is the Gargantuar battle, 20 is the Zomboss battle)
Brain Busters: Last Stand, Save Our Seeds, Locked and Loaded, Magnetic Science
Difficulty: 3 Jalapenos
Endless Zone: High Skool Prom
Reward after completing: Prom Queen Zombie trophy
Luck O' the Zombies[]
The fourth world in the game.
Story: A pot of gold has been found. Plants and zombies race to the gold. Whoever gets the pot of gold first gets everything in the shopping mall for an entire year!
Based around: St. Patrick's Day
Zombies: Basic: Lucky Zombie, Lucky Conehead, Lucky Buckethead, Lucky Flag Zombie, Leprechaun Imp, Gargantuar Leprechaun
Already existing:
Main mechanic: Gold power-up, rainbows that do passive damage to both plants and zombies
Surprise attack: Gold Rain!
Levels: 20 (10 is the Gargantuar battle, 20 is the Zomboss battle)
Brain Busters: Last Stand, Locked and Loaded, Save Our Seeds, Beghouled
Difficulty: 3 Jalapenos
Endless Zone: The End of the Rainbow
Reward upon completion: Dodo Rider Zombie trophy
The Springening[]
The fifth world in the game.
Story: It's egg hunting season, but some mysterious culprits are stealing the Easter eggs. The plants must find them, before Easter festivities are ruined. RUINED!
Based around: Easter
Zombies: Basic: Easter Zombie, Easter Conehead, Easter Buckethead, Easter Flag Zombie, 
From previous worlds:
Main mechanic: Grow tiles (Plants on grow tiles have stronger attack and more health).
Surprise attack: Egg Drop!
Levels: 20 (10 is the Gargantuar Battle, 20 is the Zomboss battle)
Brain Busters: Save Our Seeds, Vasebreaker, Special Delivery, Locked and Loaded
Difficulty: 3 Jalapenos
Endless Zone: Garden of Doom
Reward upon completion: Easter Gargantuar trophy
Summer Nights[]
The sixth world in the game.
Story: It's Suburbia's annual Grill-Off, and as the plants train, the zombies try to steal some of their gear, and cheat in the Grill-Off! Strawburst won't let the party poopers crash the party, however, and the chase it on!
Based around: Summer/ 4th of July
Zombies: Basic: Party Zombie, Party Conehead Party Buckethead, Party Flag Zombie, Hot Dog Imp, BBQ Gargantuar
Already Existing:
Main mechanic: Nighttime (sun doesn't fall from the sky); slider tiles (inflatable pools)
Surprise attack: Wiener Drop!
Levels: 30 (15 is the Gargantuar battle, 30 is the Zomboss battle)
Brain Busters: Vasebreaker, Save Our Seeds, Last Stand, Plant Matching
Difficulty: 4 Jalapenos
Endless Zone: Grill-Off Aftermath.
Reward upon completion: Unlife of the Party trophy
Moonbrain Festival[]
The seventh world in the game.
Story: The plants travel to China to visit some of their Chinese friends (possibly for business purposes) and just in time for the fall festival. Turns out, there's zombies there, as well, and they're very hungry this time of year.
Based around: Chinese Fall Festival
Zombies: Basic: 
Already existing:
Main mechanic: Plant food tiles (they give plant food when planted on, they act like gold tiles)
Surprise attack: None
Levels: 30 (15 is the Gargantuar battle, 30 is the Zomboss battle)
Brain Busters: Last Stand, Save Our Seeds, Special Delivery, Powder Keg
Difficulty: 3 Jalapenos
Endless Zone: Death Quong-Do
Reward upon completion: Talisman Zombie trophy
Zombieween[]
The eighth world in the game.
Story: Crazy Dave goes to get a taco, but gets lost in the woods, because he's Crazy Dave. Now him, Penny, and the plants have to find their way out before the zombies get their brainz!
Based around: Halloween (again).
Zombies: Basic:
From previous worlds:
Main mechanic: Graves, bones that zombies can pick up and use as weapons
Surprise attack: Graveyard Ambush!
Levels: 30 (15 is Gargantuar battle, 30 is Zomboss battle)
Brain Busters: Save Our Seeds, Special Delivery, Locked and Loaded, Mummy Memory
Difficulty: 3 Jalapenos
Endless Zone: The Whistling Woods
Reward upon completion: Pumpkinhead Zombie trophy
Zombie Caroling[]
The ninth world in the game.
Story: Once again, the plants have to save Christmas. This time, the zombies have stolen the presents for everyone in Suburbia, and the plants must return them before Christmas morning.
Based around: Christmas (again)
Zombies: Basic: Feastivus Zombie, Feastivus Conehead, Feastivus Buckethead, Feastivus Flag Zombie Feastivus Imp Feastivus Gargantuar
From previous worlds:
Main mechanic: Prize presents, Frozen zombies
Surprise attack: Gift Stealing Party!
Levels: 25 (12 is the Gargantuar battle, 25 is the Zomboss battle)
Brain Busters: Gift delivery, Last Stand, Locked and Loaded, Special Delivery
Difficulty: 3 Jalapenos
Endless Zone: The Nightmare before Feastivus.
Reward upon completion: Snowman Zombie trophy
Season 2[]
Season 2 starts introducing more complex levels, mechanics, and objectives.
Year of the Chicken Wrangler[]
The tenth world in the game.
Story: The plants come back to China just in time for the Chinese New Year....only for the same problems as last time to arise again.
Based around: Chinese New Year
Plants: 
(not manually controlled in this game) 
Zombies: Basic: 
From previous worlds:
Main mechanic: Lion Dancers, Plant food tiles
Surprise attack: None
Levels: 20 (10 is the Gargantuar battle, 20 is the Zombos battle)
Brain Busters: Bronze Matrix, Powder Keg, Last Stand, Save Our Seeds
Difficulty: 4 Jalapenos
Endless Zone: The Parade of Horrors
Reward upon completion: Chicken Wrangler Zombie trophy
Cherry Bomb Festival[]
The eleventh world in the game.
Story: After China, the plants decide to stop by Japan for the Spring festival. Cherry Bomb believes that the zombies have followed them, but the other plants won't listen to them (because they are having too much fun). They must now get the help of a couple of misfits to prevent the zombies from invading the festival.
Based around: Japanese Cherry Blossom Festival
Zombies: Basic: Japanese Zombie, Japanese Conehead, Japanese Buckethead, Japanese Flag Zombie, 
Sumo Gargantuar
From previous worlds:
Main mechanic: Cherry Blossoms (that do damage when an explosive plants explodes near them)
Surprise attack: Ninja Drop!
Levels: 20 (10 is the Gargantuar battle, 20 is the Zomboss battle)
Brain Busters: Plant Formation, Locked and Loaded, Last Stand, Special Delivery
Difficulty: 3 Jalapenos
Endless Zone: Anime Convention
Reward upon completion: Cherry Bomb trophy
The Raiding Game[]
The twelfth world in the game.
Story: Because of an advertisement on a cereal box, Crazy Dave and the plants are now in the seven seas, searching for treasure. Sea-shroom discovers, in the process, that Zomboss plans on bringing pirate souls out of Davy Jones' Locker to bring terror and fear to the harbor. Can the plants save the harbor from the haunted ghosts of the lost loot?
Based around: Summer (again)
Zombies: Basic: 
From previous worlds:
Main mechanic: Water (lily pads)
Surprise attack: Raiding Party!
Levels: 30 (15 is the Gargantuar battle, 30 is the Zomboss battle)
Brain Busters: Last Stand, Locked and Loaded, Special Delivery, It's Raining Seeds
Difficulty: 4 Jalapenos
Endless Zone: Davy Jones' Locker!
Reward upon completion: Captain Deadbeard trophy
Bully for You[]
The thirteenth world in the game.
Story: Fed up with his lack of victories, Zomboss enforces better training policies and makes big headed zombies. Who will stop him and his undead crew, this time?
Based around: Back to School
Zombies: Basic: Big Head Zombie, Big ConeHead, Big BucketHead, Big Head Flag Zombie, Big Head Imp, Big Head Gargantuar
From previous worlds:
Main mechanic: Big head zombies have double HP. Books on the lawn will give any zombie that picks them up big heads. Books can also give a plant a free plant food effect.
Surprise attack: None
Levels: 20 (10 is the Gargantuar battle, 20 is the Zomboss battle)
Brain Busters: Save Our Seeds, Last Stand, Locked and Loaded, Beghouled
Difficulty: 3 Jalapenos
Endless Zone: Detention of Doom
Reward upon completion: Graduate Zombie trophy
Zombitorium Manor[]
The fourteenth world in the game.
Story: Puff-shroom has been sent to infiltrate Immorticia's plans to unleash Zom-Bats onto the citizens of Suburbia. Just then, he's captured by a plant known as Witch Hazel, who's been sent on a similar mission. Puff-shroom then discovers something he will never forget!
Based around: Halloween (again)
Plants: Witch Hazel; 
Zombies: Basic:
From previous worlds:
Main mechanic: Afterlife, Darkness
Surprise attack: Electric Shock!
Levels: 30 (15 is the Gargantuar battle, 30 is the Zomboss battle)
Brain Busters: Save our Seeds, Vasebreaker, Beghouled, Locked and Loaded, Hide and Seek
Difficulty: 4 Jalapenos
Endless Zone: Secret Room of Torture
Reward upon completion: Haunting Zombie trophy
Winter WonderGarden[]
The fifteenth world in the game.
Story: Snow has fallen, and the world looks lovely and sparkly...then Zomboss shows up to ruin the holiday fun once more, thanks to his monstrous heat generator designed for melting snow. Talk about global warming!
Based around: Christmas (again)
Plants: 
Parsnip 
Zombies: Basic: Feastivus Zombie, Feastivus Conehead, Feastivus Buckethead, Feastivus Flag Zombie, Feastivus Imp, Feastivus Gargantuar
From previous worlds:
Main mechanic: Frozen zombies, Nighttime, Icicles
Surprise attack: None
Levels: 25 (12 is the Gargantuar battle, 25 is the Zomboss battle)
Brain Busters: Brain Ball Kickoffs, Mummy Memory, Last Stand, Locked and Loaded
Difficulty: 4 Jalapenos
Endless Zone: The Shopping Mall
Reward upon completion: Feastivus Imp trophy
Season 3[]
Season 3 capitalizes upon previous mechanics, and introduces new ones.
Birthdayz[]
The sixteenth world in the game.
Story: It's Crazy Dave's birthday, but the zombies, testing teleportation technology, have plans on crashing the party.
Based around: PvZ's anniversary.
Zombies: Basic: Birthdayz Zombie, Birthdayz Conehead, Birthdayz Buckethead Birthdayz Flag Zombie, 
From previous worlds:
Main mechanic: Portals (The ones from the mini-game, Portal Combat); Senor Pinata (at the end of every level, you can get a whack at Senor Pinata)
Surprise attack: Cakesplosion!
Levels: 30 (15 is the Gargantuar battle, 30 is the Zomboss battle)
Brain Busters: Beghouled, Special Delivery, Save Our Seeds, Locked and Loaded, Plant CU
Difficulty: 3 Jalapenos
Endless Zone: Bounce House of Shame
Reward upon completion: Jester Zombie trophy
Spud of the North[]
The seventeenth world in the game.
Story: Prehistoric life forms have been discovered in the South Pole, and Zomboss has plans of using global warming to free them from their ice prisons and use them for evil, but the plants have a few prehistoric tricks up their sleeves.
Based around: Christmas (again)
Zombies: Basic: 
From previous worlds:
Main mechanic: Frozen zombies, water, chilling winds
Surprise attack: Snowstorm!
Levels: 25 (12 is the Gargantuar battle, 25 is the Zomboss battle)
Brain Busters: Last Stand, Locked and Loaded, Save Our Seeds, Dodo's Adventure
Difficulty: 4 Jalapenos
Endless Zone: The South Pole
Reward upon completion: Hunter Zombie trophy
Season 4[]
Not much has changed here, apart from a 3 part world.
Return to Lost City[]
The eighteenth world in the game.
Story: The Lost City has since been discovered and there's a museum dedicated to the discoveries of this ancient society...and Zomboss wants to claim the discoveries for himself!
Based around: Central American culture/Summer (again)
Zombies: Basic: 
From previous worlds:
Main mechanic: Gold tiles
Surprise attack: Parachute Rain!
Levels: 25 (12 is the Gargantuar battle, 25 is the Zomboss battle)
Brain Busters: Vasebreaker, Unsodded, Last Stand, Trap Tiles, Special Delivery
Difficulty: 4 Jalapenos
Endless Zone: Kingdom of the Turquoise Skull
Reward upon completion: Lost Pilot Zombie trophy
Brain Ball[]
The nineteenth world in the game.
Based around: Start of the NFL season.
Plants: Laser Bean, Cactus, Homing Thistle, Citron, and Power Lily.
Finding Zombie Yeti[]
The twentieth world in the game.
Based around: Christmas (again)
Plants: [Insert Modern Day Part 2 plant here], Nightshade, Moonflower, Primal Wall-nut, and Yeti Chomper.
Season 5[]
Old favorites return, as well as new and interesting mechanics to really challenge the player.
Revenge of Big Wave Beach[]
The twenty-first world in the game.
Based around: Summer/Big Wave Beach.
Plants: Lily Pad, Tangle Kelp, Lava Guava, Guacodile, and Banana Launcher.
Invasion of the Brain Snatchers[]
The twenty-second world in the game.
Based around: Halloween (again).
Plants: Saucer Squash, Spore-shroom, Alien-shroom, Bowling Bulbs, and Spring-shroom.
Skiing on Zomboss Mountain[]
The twenty-third world in the game.
Based around: Chirstmas (again)
Plants: [Insert Modern Day Part 2 plant here], Spinnapple, Cattail (She uses a rainbow to fly), Carrot Rocket, and Acesparagus.
Season 6[]
This contains more content compared to previous seasons.
Love, Zombie King[]
The twenty-fourth world in the game.
Bon Voyage, Crazy Dave![]
The twenty-fifth world in the game.
Imp Camp[]
The twenty-sixth world in the game.
Zombiversal Studios[]
The twenty-seventh world in the game.
Twisted challenge of twistiness[]
This is a giant bonus episode, where each level is based on a different, miscellaneous holiday and/or event.