Plants vs. Zombies Cheats for the iPhone

Digging all the way to China
On the awards page, scroll down like crazy. On the way down, you'll see tons of random and strange objects, like a worm with the head of a zombie. Well after awhile, you'll get to China and see Chinese zombies (zombies dressed as Chinese).

Yeti Zombie
Just finish adventure once then play crazy dave's challenge when he picks 3 of your seeds then reach stage 4-10 and yeti zombie will appear there.
Yeti Zombie - Beat adventure once then play adventure again and reach stage 4-10

Defeating the final Boss
The final Boss will launch massive fire balls and ice balls at your plants. They will crush everything in their path except for zombies (basically, all plants in that row). To destroy the ice ball, use a Chili Pepper in that row. To destroy the fire ball, use an Ice Shroom, but also with a Coffee Bean or else it will fall asleep.

Getting light in fog
When you are in fog and need light (and you do not have a lantern), use the torch wood if you have the sun. It shows you the space in front of it.

Gold trophy
Get all the trophies in Mini-Games, Puzzle, and Survival modes.