Who did
this?!
Every book opens with one ridiculous disaster and a crowd of suspects. Each math clue rules some of them out, until only one prankster is left. The answer isn't printed in the book. Kids check it online when they've cracked the case.
Three steps to the culprit
- 1
Read the disaster
Somebody flooded the principal's office with rubber ducks. Somebody buried a cinema in popcorn. Who?
- 2
Solve each math clue
Every clue is a real math task. Its answer tells you which suspects to cross out.
- 3
Catch the prankster
Keep going until one suspect is left. Then check online whether you got it right.
NEW
The Rubber Duck Disaster
Somebody filled Principal Crumb's office with rubber ducks. Ten thousand of them. He wants answers, and the ducks aren't talking.
- 1,000 suspects, 11 math clues, 1 prankster
- Every clue is a real math task, and its answer tells you who to cross out
- One big case across the whole book, not random worksheets
NEW
The Great Popcorn Disaster
Somebody filled the cinema with popcorn. Mr. Butterworth, the very grumpy manager, wants answers. The popcorn isn't talking either.
- 1,500 suspects, 13 math clues, 1 prankster
- A step up from Case 01: more suspects, harder math
- Stands on its own, so kids can start with either book
