Plants vs. Zombies: Internet Action

Plants vs. Zombies: Internet Action is a game that as new features involving the internet, including, co-op, and vs.

New features
Online co-op: Play with your friends online

Online vs.: Either live, or send zombie attacks if your friends aren't avalible.

DLC: Buy DLC worlds that are based on previous games, or unlock them by completing the game 100% with an exeption of spending real money.

Firey plant food: Plant food that does an even better super attack.

Level creating: create challenges for yourself and friends. (you don't create the entire level)

More Bosses: Even harder and even more bosses.

New Worlds: Including, mushroom grotto, Dark graveyard, and more

Bigger store: The store has more than $500,000 of buyables

Firey Plant Food
Firey plant food is another version of plant food that is more powerful than normal plant-food. It has a more powerful effect on plants. For example instead of spawning 250 sun, twin sunflower will make all plants invunrable for 10 seconds. Instead of shooting a barrage of peas, pea shooters and repeaters will turn red, and shoots flaming peas forever.

Worlds
The list of worlds:

World 1: Grassy Green Lawn

World 2: Pool

World 3: Mushroom Grotto

World 4: Cloud World

World 5: The Old West

World 6: Zomboss lair

World 7: Dark Graveyard

World 8: Challenge World

DLC 1: Grotto (day)

DLC 2: Roof

DLC 3: Ancient Egypt

Boss Fights
Almost each world has a boss.

World 1: Zomboss in Zombot

World 2: Destroyer

World 3: Gargantuar Stage

World 4: Zomboss in flying mech

World 5: Giga-Gargantuar

World 6: Zomboss in Zombot (Hard)

World 7: Zomboss in giant Zomplin (Zeplin)