This tip or trick whatever you call it only works in pool/day levels. All you have to do is plant sun flower in the top left coner. Get sun plant another next to it. And if any Zombies come plant potato mine. Plant 4 sun flowers in the bottom left. Plant 8 lily pads. 4 next to the mower/pool cleaner make a space and plant the other 4. Plant 2 wall-nut on the last 2 lilies and make a 2-colmn of sun flowers and the rest of the space plant whatever you like. Hope it works!
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Use cheat engine.
you can't add cheats on plant vs zombies but you can type on the screen the normal cheats like daisies,future etc.
There is a list of the various codes you can use on Chewy Central.
TrickeDout Pinata Daisies Sunny Days Tohot Future Mustache
plants vs zombies
Plants vs. Zombies happened in 2009.
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If you have Windows 7 you have Plants vs. Zombies for Free