Originally Posted by TheClaff
I assume spend a lot of coins on the powers.
Not at all. I beat this level on my second attempt, as on the first try a chicken zombie came out immediately, and there was no way to defend against that. :P
The tricks to this level:
1) Hold out as long as possible, because you'll eventually be given loads of cherry bombs to clear the field.
2) Remember that powering up a puff-shroom powers up every puff-shroom on the field at the same time (I ended up with an unexpected achievement for powering 20 at once), so you want most of the level filled with them.
3) If you keep planting puff-shrooms in front of a mecha-football zombie, it'll never go anywhere, and will just keep shunting the row back. The plants are doled out fast enough to make this possible.