Fuzzy Mud
"Two middle-grade kids take a shortcut home from school and discover what looks like fuzzy mud but is actually a substance with the potential to wreak havoc on the entire world"--Provided by publisher.
Readers also enjoyed
More by Louis Sachar
Holes
Sideways Stories from Wayside School
There's a Boy in the Girl's Bathroom (Cascades)
Wayside School is Falling Down (Wayside School #2)
Small Steps
Wayside School Gets a Little Stranger
Sixth Grade Secrets
Sideways Arithmetic from Wayside School (Wayside School #2.5)
A Magic Crystal? (Marvin Redpost)
Marvin Redpost
The Boy Who Lost His Face
Wayside School Beneath the Cloud of Doom