While playing a game of frisbee, Joni accidentally tosses the disc over the fence into the overgrown yard of Miss Rose, an apparently friendly old woman living next door. She and Santiago enter Miss Rose's yard to find the frisbee when the ground literally opens up and swallows them. Owen and Leslie rush into the yard to find Joni and Santiago have vanished into thin air. Owen, Leslie and LapTrap discover that Miss Rose's tool shed is actually a passageway that leads into an underground labyrinth inhabited by self-aware, anthropomorphicplants who happen to speak English. The plants have kidnapped Joni and Santiago and have concocted a mad plan to attack the town above.
Skills
Language Arts
Game
Skill
Steps of Expression
Reading Comprehension and Grammar
Mysterious Locks
Reading for Information
Perilous Faults
Spelling and Vocabulary
Pollution Detectives
Reading for Information
Mathematics
Game
Skill
Cave of Danger
Whole Number Computation
Recipe for Disaster
Fraction and Decimal Addition and Subtraction
Bacterial Growth
Word Problems
Science
Game
Skill
Mysterious Locks
Biology
Social Studies
Game
Skill
Mysterious Locks
World Cultures and Geography
Chasm of Time
History and World Cultures
Problem Solving
Game
Skill
Bacterial Growth
Logical Reasoning
Pollution Solution
Logical Reasoning
The game's conclusion
It turns out that the plants want to attack the town because various factories have been polluting the water supply of the plant empire for years. The ClueFinders are reunited in the "throne room" of the plant empire, only to discover that Miss Rose is the plants' queen, having disguised herself as a human to go above ground. Santiago informs her that polluting the environment is illegal, which she apparently never discovered in all her time disguised as a human. Santiago suggests the ClueFinders could track down the polluting factories and report them to the authorities, thus saving both the plant empire and the town.
Miss Rose agrees, but adds that they must also clean up the existing pollution and demands a "hostage for security". Joni promptly volunteers herself. As the user completes the activities that entail tracking down the polluting companies and cleaning up the plants' water supply, Joni starts to turn green and seems to begin transforming into a plant herself. Miss Rose says this is because the plants' water supply is polluted. Once all the pollution is cleaned up, Joni is saved and the memories of the human hostages are wiped, leaving the ClueFinders the only ones who know of the plant empire. Owen and Leslie promise to keep the the existence of the empire a secret.
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