Plants Vs Zombies 2 PC Cheats and Tips

Pretty simple. First, you grab your best plants + corn launchers + sunflowers. Then, you save the back row for sunflowers, front row for wallnuts, & place all the other plants for the middle. Also, save your plant food for the corn, so whenever the giant zombies come, you can stop them with the butter. I hope that helped you as much as it helped me!
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Dude the only way to unlock that lighting thing is to wait until pop cap add more updates I hope this helps bro

The question mark world is a new world comming out soon also that sucks I lost my keys to a ? World when it came out

I'm not sure you can. I've tried, but nothing has worked so far. The only other way is to use gamehacker download. Without root helps. I need to try it, but when I do, I'll tell you.

Do you mean the last world? There is often a greyed out final world, I think it just means another world is coming soon . You just have to wait for it, Popcap seem to be continually evolving the game and adding new worlds and levels.