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.