When Dr. Zomboss comes down to throw an ice ball or fire ball, you can use Freeze Shrooms to freeze him. This allows your various pults time to get some damage on Dr. Zomboss himself. Jalapenos will also cause damage to him when he is down to toss a fire or ice ball. The more damage you can do to Dr. Zomboss, the faster and easier it is to end this level. Save at least one Freeze Shroom and one Jalapeno for whatever he tosses.
Use the following plant formation with the following items.
In the morning:
0 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 80 1 2 3 4 6 8At night:
0 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 60 2 3 4 9 X 7 7 7 6The 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.
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 Type mustache during a level after you finish selecting your plants.
 Note: This requires some time and skill. Start by crushing the green ones where plants are, in this order.
Try to smash the vases in columns, then wait for the zombies to get to another vase column and smash them. Your goal is to make them walk as one group and to gather them. They will eventually meet a squash at the start of the lane and it will "squash" them all. This may require several attempts.
 You cannot place the Hypno-Shroom in front of a Disco Zombie because he will raise four zombies, and one of them will be at front of Disco Zombie. Place the Hypno Shroom at his feet the moment he raises the four zombies. By doing this, the shroom will be at the center and Disco Zombie will have to eat it.
 This is easy to accomplish after unlocking Cabbage Pults and other plant catapults. Do not use a peashooter of any kind.
 Towards the middle of the game, more zombies will arrive at the start of each flag wave. Wait for all of them to show up, then place a Cherry Bomb to blow up ten zombies.
 Begin an easy survival day. It will be difficult because you can only plant Mushrooms and Coffee Beans. Focus on planting Sunshrooms. Ignore the first zombies and allow the lawnmowers to take care of them. To defend the Sunshrooms, plant long range Puff Shrooms in front of them. You will mostly have normal zombies and eventually a few Coneheads to contend with. At least two columns of long range defenders will be effective. Although it will require some time, you will eventually succeed.