This is me playing GAME OF THE YEAR version and using Cheat Engine, I could unlock some hidden minigames. This minigames is Art Challenge Sunflower and its main purpose is to fill the outlined spaces with Wall-nuts, Starfruits and Umbrella Leaves respectively.
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Change its value to 144. For more information, check out Plants vs. Zombies Wiki! http://plantsvszombies.wikia.com/wiki/Art_Challenge_Sunflower http://plantsvszombies.wikia.com/wiki/Limbo_Page
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Sunny Day is one of the 17 hidden mini-games, which can only be accessed using a Cheat Engine...