Guess what! This level is really hard. Shocking, we know, but we’ll help you. With our walkthrough, you should have no problem succeeding in level 15 of the Frostbite Caves world. The goal is to prevent the two Pepper-Pults from being devoured by the walking dead. Aside from that, the level is pretty normal, as you get to choose your plants yourself. The difficult part about this stage are the four major waves of zombies, which all get pointed to the lane of the precious Pepper-Pults. We recommend equipping yourself with Sun-Shrooms, Hot Potatoes (snowstorms and Hunter Zombies ahead), Pepper-Pults, Chard Guards, Bowling Bulbs, Lightning Reeds, and Blovers (blow those Dodo Riders away).
First and foremost, plant five Sun-Shrooms and plant one Lightning Reed in the middle of your second row. Next, defend your precious Pepper-Pults by placing Chard Guards in front of them. Then, we would recommend placing at least one additional Pepper-Pult per lane. Switch doing this with placing more Chard Guards. Afterwards, we recommend placing one more Lightning Reed in the middle lane and three Bowling Bulbs in the three lanes in the middle.
Having the Pepper-Pults flank your lanes will quickly thaw your plants after a blizzard. Make sure to always replace used up Chard Guards. You can easily do this by placing a new one on the broken one. It will automatically replace it. Try to stick to this walkthrough, but stay flexible when necessary.