From the Super Mario Wiki
This microgame is based on the video game Greenhouse in the Game & Watch series. The purpose of the game is to spray the two worms that try to eat the plants in a greenhouse. The worms crawl along the vines to reach the plants. The player needs to tap the silhouettes left and right to have the guy spray the worms before they reach the plants. If the player doesn't tap the silhouettes before the worms reaches the plants, the game ends in a loss.
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