Survival Stages
In the special survival stages it is important to stay on your toes and throw the randomly offered object into the most pressing lane. If you have been given a defensive tool, put it in a lane that does not have any firepower attached to it yet. If it is an offensive unit put it in the lane that has the most threat.
Sunflowers
You should try to get at least three sunflowers to play each level, but do not focus on them from the very start or you will soon become overwhelmed by the approaching undead. Instead, focus on planting sunflowers and planting offensive plants and defensive items.
Potato Mine
You always want to take the Potato Mine into each stage. At a cost of 25 suns it is very cheap and has a quick recharge. It is specifically useful when you need to build up your economy rather than splurging on offense. The Wall-nut is also great for keeping enemies at bay.
Power ups
The power ups in this game are really powerful, so save them up for the Star missions which are much harder than the regular stages. Do not use them in the main campaign missions- earn your coins in these levels and then spend them in the star stages. The best power up is the gusty wind as it can clear the entire screen of zombies very quickly.
Fire-Flinging Plant
Certain plants can fire through three entire lanes- put these in the middle of the map where they can do the most damage. The fire flinging plant is particularly good because it only costs 150 suns to deploy and can clear out a lot of the undead.
Wall-nuts
Take care when deploying wall-nuts on the lawn- they are very useful but they also take a long time to recharge.
Egyptian Stages
Some of the zombies are protected by pottery in the Egyptian stages. If you want to take these guys out quickly get a Bloomerang plant into play- these are great for chipping through zombies and zombie armor!
Plant Food
Do not forget that you can use plant food on sun-generating flowers as well as offensive units. It is well worth spending your money topping up this powerful upgrade in those star levels that challenge you to earn a certain amount of sunlight over a very short period of time.
Pirate Stages
Unlock the cherry bomb and the extra plant slot as soon as possible as they are both extremely useful in these levels. The latter is particularly important as it allows you to field seven object types rather than six.
Get Rid of Your Items
You can get rid of items you have placed on the lawn and get some currency refunded back.
