-1-5 introduces a snow minigame and it is interesting. All plants are now weak, can instantly be eaten in one bite. Because it's so cold, the plants eventually die. The way for them to survive is with a warm plant, so a Torchwood is shown being used. It warms up plants in a 3x3 area. Snow Peas do not require warm plants and survive on their own.
-1-6 introduces the new plant, Giant Leaf. This blocks out certain enemies such as Weegee or the Apple Flag Zombie.
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https://www.youtube.com/watch?v=EkKCFGncq-4
This is the final one! We're not up to 100 songs but we are somewhere in the 90s, regardless. This is epic.
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https://www.youtube.com/watch?v=Jrmeqin8kuI